Which performs first WHERE clause or JOIN clause
sql,sql-server,select,join,where
The conceptual order of query processing is: 1. FROM 2. WHERE 3. GROUP BY 4. HAVING 5. SELECT 6. ORDER BY But this is just a conceptual order. In fact the engine may decide to rearrange clauses. Here is proof. Lets make 2 tables with 1000000 rows each: CREATE TABLE...
Making an efficient query with 7 joins, JPA or SQL? What type of collection?
You say that the native SQL query runs in less than a millisecond. So stick with that. But that doesn't mean you have to wrestle with the List that comes from query.getResultList(). You can execute a native query (either from EntityManager.createNativeQuery() or from EntityManager.createNamedQuery() referring to a @NamedNativeQuery) and still...
ms access query very slow
You do have a complicated mess with those calculated fields. Why not join more directly? This query below leaves one '/' unaccounted for, but should tell you what I'm thinking of. SELECT t1.sb, left(st1.uchbegriff,7) & val(right(t1.suchbegriff,4)) AS suchbegriff2, t1.menge FROM kvks AS t1 INNER JOIN konf AS t2 WHERE (t1.suchbegriff...
t-SQL what is the maximum number of tables I am able to join? [duplicate]
This is very bad form (using *) but you can simply keep adding tables with out specifying columns as so: select * from table1 inner join table2 on table1.id1 = table2.id2; add another table by changing the above to: select * from table1 inner join table2 on table1.id1 = table2.id2...
Learning to use Advanced features of SQL
You should: SELECT u.id, u.name, u.location_id, l.city, l.state FROM user u -- identify columns from user table with 'u.' LEFT OUTER JOIN location l -- identify columns from location with 'l.' ON u.location_id = l.id --- the join predicate when the two ids match WHERE l.state = 'Arkansas' -- other...
Adding entries from multiple MySQL tables using one single SQL join statement, but only if there are entries available in the second table
You can use a LEFT JOIN on the project table to make sure that all projects appear in the result set even if they have no matching value in the source table. Projects from the project table which do not match will have NULL for their value. SELECT project.description AS...
MySQL: Remove JOIN for Matched Row if 2nd Round of Criteria Not Met
Your first query: SELECT *, @MidMatch := IF(LEFT(l.middle,1)=LEFT(d.middle,1),"TRUE","FALSE") MidMatch, @AddressMatch := IF(left(l.address,5)=left(d.address,5),"TRUE","FALSE") AddressMatch, @PhoneMatch := IF(right(l.phone,4)=right(d.phone,4),"TRUE","FALSE") PhoneMatch, @Points := IF(@MidMatch = "TRUE",4,0) + IF(@AddressMatch = "TRUE",3,0) + IF(@PhoneMatch = "TRUE",1,0) Points FROM list l LEFT JOIN database d on IF(@Points <> 0,(l.first = d.first AND l.last = d.last),(l.first = d.first...
Unable to get correct data over several joins
mysql,database,join,relational-database,jointable
The reason you are seeing attribute_id as null is because it is null inside the attributes_options table. This makes sense, because there is no option for those examples. To work around this, you should explicitly set the columns you want to select, from the tables where you would expect the...
Inefficient execution plan on MySQL query with multiple joins
Consider adding an index on section.last_member, section.id. ALTER TABLE section ADD KEY(last_member, id); If they are innodb you can omit ID since it is already a PK....
MySQL: Join distinct rows of two tables in a certain order?
I believe this is what you're looking for: (This is assuming that 1 to 1 relationship) SET @UNITRN := 0; SET @TRANSRN :=0; SELECT A.`unit_date`, A.`unit_id`, B.`tran_date`, B.`tran_id`, A.`unit_sku` FROM (SELECT @UNITRN := @UNITRN + 1 AS ROWNUM, UNIT_DATE, UNIT_ID, UNIT_SKU FROM UNITS ORDER BY UNIT_SKU, UNIT_DATE ASC) A JOIN...
Python: too many joins()?
self.dest_path = join(destination, self.new_name) # error here self.new_name is not a string, it's a tuple, so you can't use it as the second argument to join. Perhaps you meant to join destination with just the last element of self.new_name? self.dest_path = join(destination, self.new_name[1]) ...
update rows after left join
You shouldn't be using a LEFT JOIN, since you only want to update rows in table1 that have a matching row in table2. Try: UPDATE table1 AS t1 JOIN table2 AS t2 ON t1.id = t2.id SET t1.job = t2.job, t2.inserted = 1 WHERE t2.inserted = 0 DEMO...
Update a field from one table to another, involving a 3 table join
are you able to show us the table structures in more detail? if both tableA and tableC have a foreign key that points back to tableB I don't think you need to include a three table join. you just need to update tableA set ITEM_PRICE = SELECT(PRICE FROM TableC WHERE...
Join multiple values to virtual columns
Here is an example for your usecase. First build up your structure (like in task description): CREATE TABLE table1( type varchar(20) ); CREATE TABLE table2( name varchar(20), color varchar(20), icon varchar(20), type varchar(20) ); Then insert some sample data: INSERT INTO table1 VALUES ('value1'); INSERT INTO table1 VALUES ('value2'); INSERT...
MS Access multi (INNER, LEFT & RIGHT) JOIN query
sql,ms-access,join,ms-access-2010,outer-join
Well one solution is to split the query so that it doesn't have these conflicting joins So create a query e.g q1 SELECT * FROM ( ( ITA INNER JOIN YEARS ON ITA.ID_YEAR = YEARS.ID ) LEFT JOIN ITA_INSPECTORS ON ITA.ID = ITA_INSPECTORS.ID_ITA ) and then create a 2nd query...
INNER JOIN clause ignoring NULL values
sql-server,sql-server-2008,join
You are actually looking for LEFT JOIN: SELECT pd.fname, pd.lname, pp.drug_name, pp.drug_strength FROM patient_data pd FULL OUTER JOIN patient_prescr pp on pp.pid = pd.pid FULL OUTER JOIN formulary f on pp.med_id = f.id LEFT JOIN formulary_categories fc on f.category = fc.id AND fc.id in (34,36,37,38,5) WHERE pd.lname = 'Test' A...
Full Outer Join (left join union right join) MySQL multiple tables
Just have a look at Below query, Hope this may help you! Later you can Modify Accordingly This will join to all 5 tables. Here I kept Location as the Left Table so that All locations will be Displaying after firing this query and matching Id's will be matched to...
Is there a difference between using for-each and Contains in joining on a qeury
You should definitely use contains because it will be executed in database and reduce the size of data that will be transferred between client and database. Also using foreach will reduce readability of your code
Understanding cartesian product in SQL
mysql,sql,select,join,cartesian-product
A Cartesian join joins every record in the first table with every record in the second table, so since your table has 7 rows and it's joined with itself, it should return 49 records had you not had a where clause. Your where clause only allows records where a's balance...
joining two tables by value of one column and calculating
sql,sql-server,join,sql-server-2014
Try this: SELECT A.sifKorisnikPK, IsNull(BrojDobrih,0) BrojDobrih, IsNull(BrojLosih,0) BrojLosih FROM (select distinct sifKorisnikPK from Rezervacija) A LEFT JOIN #LosaRez B ON A.sifKorisnikPK = B.sifKorisnikPK LEFT JOIN #DobraRez C ON A.sifKorisnikPK = C.sifKorisnikPK ORDER BY (IsNull(BrojDobrih,0) - IsNull(BrojLosih,0)) ...
Shaping dataset in MySQL with a multiple inner join
mysql,sql-server,join,distinct
What if you add a GROUP BY to your existing query like SELECT customer_info.customerid, customer_info.firstname, customer_info.lastname, customer_info.city, customer_info.state, GROUP_CONCAT( purchases.item), customer_favorite_colors.favorite_color FROM customer_info INNER JOIN purchases ON customer_info.customerid = purchases.customerid INNER JOIN customer_favorite_colors ON purchases.customerid = customer_favorite_colors.customerid GROUP BY customer_info.customerid, customer_info.firstname, customer_info.lastname, customer_info.city,...
Python : The most efficient way to join two very big (20+ GB) datasets?
sort -o df_ns.csv df_ns.csv && \ sort -o df_ip.csv df_ip.csv && \ join -t'|' df_ns.csv df_ip.csv > df_combined.csv Reference: http://linux.die.net/man/1/join...
Join master table's data to a key/value table data in one SELECT
sql,sql-server,join,pivot,key-value
SELECT Contacts.FirstName, Contacts.LastName, Properties.Name, ContactsExtra.PropertyValue FROM Contacts LEFT OUTER JOIN ContactsExtra ON Contacts.Id = ContactsExtra.ContactId LEFT OUTER JOIN Properties ON ContactsExtra.PropertyId = Properties.Id Okay, here's the update with a PIVOT (not UNPIVOT as I first thought)... SELECT * FROM ( SELECT Contacts.FirstName, Contacts.LastName, Properties.Name, ContactsExtra.PropertyValue FROM Contacts LEFT OUTER JOIN...
PHP Select Count and Left Join where
The problem is here $zaznam[logoff]=='n'. There must be any column name where you have written $zaznam[logoff]. For Applying Left Join you should do something like this: SELECT COUNT(*) FROM app_tgp t1 LEFT JOIN app_training t2 on t1.idt = t2.id WHERE t1.idt='$zaznam[id]' AND ( t1.partic='' OR t1.partic='y' OR (t1.partic=='n' AND t2.your_column_name_here=='n'))...
SQL Server - Substitute for OR when JOINing on non-indexed field
sql-server,join,query-performance
You can try using LIKE WITH AgentRecordings AS ( SELECT a.name, r.recordingId AS rawrecordingid, r.filename, r.recordtime, CONCAT( 'C:\Recordings\' + a.name + '\' + CONVERT(NVARCHAR(4), DATEPART(yyyy, recordtime)) + '\' + CONVERT(NVARCHAR(2), DATEPART(m, recordtime)) + '\' + FILENAME, 'C:\' + SUBSTRING(a.name, 0, CHARINDEX(' ', a.name, 0)) + '-Recordings\' + CONVERT(NVARCHAR(4), DATEPART(yyyy, recordtime))...
Rails HABTM: Select everything a that a record 'has'
ruby-on-rails,postgresql,join,has-and-belongs-to-many
The equivalent active record query would be Technology.select('name').where("id IN (?)", ProjectTechnology.where("project_id = ?", 5).pluck(:technology_id)) Hope this helps!...
2 join conditions codeigniter giving error
This is wrong in your query $this->db->join('documents as D', 'D.name="declaration"','left'); you can compare column using where clause public function get_all_orders($user_id){ $this->db->select('ordersheader.*, customer.name as customerName,documents.date_make'); $this->db->from('ordersheader'); $this->db->join('customer', 'ordersheader.idCustomer = customer.idCustomer'); $this->db->join('documents', 'ordersheader.idOrder = documents.idOrder','left'); // $this->db->join('documents as D',...
I need to join 3 tables avoiding duplicates and aggregating data from 2 of the tables
If you need to group the counts by JobID and SubID you can try SELECT s.JobID, s.SubID, c.ClickCount, o.OpenCount FROM Staging_SendLog s LEFT JOIN (SELECT JobId, SubscriberId, COUNT(*) AS ClickCount FROM Staging_DailyClicks WHERE JobID IN (63809,89993) GROUP BY JobId, SubscriberId ) c ON c.JobID = s.JobID AND c.SubscriberId = s.SubID...
Php Mysql: Retrieving 2 usernames via 2 user id
select CONCAT((select username from table1 t1 where t.user_id=t1.user_id=t.user_id) ,'-',(select username from table1 t1 where t.user_id=t1.user_id=t.user_id)) from table2 t OR select CONCAT(t1.username,'-',t3.username) from table2 t2 inner join table1 t1 on t1.user_id=t2.user_id inner join table1 t3 on t3.user_id=t2.user_id ...
Trying to join multiple tables in MySQL database and display in Web Table
just a wee pointer as to the various types of joins you can have between tables http://blog.codinghorror.com/a-visual-explanation-of-sql-joins/ With reference to your sql above that you say does not work - personally I find that syntax is unclear which doesn't help you at this point when you are trying to learn....
Nested SQL with Coalesced data part of an update statement
sql-server,join,sql-update,concat,coalesce
You can use FOR XML to concatenate update x set attended_conf = (select e.key_value + '; ' as "text()" from TX_CUST_KEYWORD e where e.customer_no = x.customer_no and e.keyword_no = 704 order by e.key_value for xml path('')) from #work x ...
How to use field value of joined table for join rather than foreign key
I'm not sure I understand your problem correctly, but if I'm reading it right - you want to have the chance to specify "Owner" or "Employee" explicitly in your WHERE clause rather than 1 or 2. Perhaps this is what you are looking for: SELECT Contact.FirstName, Contact.LastName FROM Client LEFT...
How to join with multiple tables of this complicated case?
For star schema you should join each table exactly with central table. Should be something like: select * from table_3 central join table_1 t1 on central.id = t1.central_id join table_2 t2 on central.id = t2.central_id join table_4 t4 on central.id = t4.central_id ; For case when table_1 - out of...
MySQL query JOIN with 2 tables and multiple entries
Maybe not the best way to solve this problem, but I would join tableB two times with aliases and pick the value as needed like this : SELECT tableA.ISBN, author.value as Author, title.Value as Title FROM tableA left join tableB author on tableA.ID = author.tableA_id and author.key = "Author" left...
join two different list by id into one list
Join them on id and then call ToList: var productResponses = from p in products join pd in productDescriptions on p.id equals pd.id select new ProductResponse { id = p.id, language = pd.language, // ... } var list = productResponses.ToList(); ...
MYSQL Query: JOIN Using Value from tbl 1 and concate to tbl 2
This will work assuming varchar: SELECT * FROM tbl1 JOIN tbl2 on concat(MatNr,'.1') = MART This will work assuming number: SELECT * FROM tbl1 JOIN tbl2 on MatNr = floor(MART) ...
MySQL 4 Table Join
What you probably need is a union of two sets: songs created by people user with id=6 follows songs reshared by people user with id=6 follows Since you haven't provided table schemas I'm using names you provided in the query. ( SELECT DISTINCT s.id, s.last_updated FROM follows f JOIN tracks...
Query to join two tables by mapping third table without returning all records from third table in Oracle
You need rows, where student's ID is present in at least one of tables MATHS, ENGLISH. These queries gives output you wanted: select id, s.name, m.Marks1, e.Marks2 from maths m full join english e using (id) join student s using (id); ...or: select s.id, s.name, m.Marks1, e.Marks2 from student s...
INSERT statement with INNER JOIN SELECT SUM
There's a comma missing after pg.kompetensi and you haven't included all of the required columns in your GROUP BY: SELECT pg.id_pkg , pg.id_guru , g.nama_guru , g.mapel_diampu , pg.id_penilai , p.nama_penilai , pg.tahun , pg.sem , pg.kompetensi , SUM(CASE WHEN pg.kompetensi = "1" THEN pg.jawaban ELSE 0 END) AS nilaikp1...
Propel ORM left join select
Try this select m.id, m.major, count(distinct s.id) as number_of_student , count(distinct c.id) as number_of_classroom from major m left join classroom c on (m.id = c.major_id) left join student_classroom s on (s.classroom_id = c.id and c.major_id = m.id and s.status = 'active') group by m.id order by m.id ...
CodeIgniter query to exclude a subset from results
php,mysql,codeigniter,join,codeigniter-3
You need a "not exists" clause in there as a filter. And not exists (select 1 from users_groups x where x.user_id = users_groups.user_id and group_id = 6 Im not familiar with code ignite but im sure this is doable...
Join Statement omitting entries
I tried this out, and I noticed a couple things. First: this is minor, but I think you're missing a comma in your -o specifier. I changed it to -o 1.1,2.1. But then, running it on just the fragments you posted, I got only three lines of output: 1|1 3|3...
chunk of data into fixed lengths chunks and then add a space and again add them all as a string
regex,list,join,ironpython,findall
You can simply do x="a85b080040010000" print re.sub(r"(.{2})",r"\1 ",x) or x="a85b080040010000" print " ".join([i for i in re.split(r"(.{2})",x) if i]) ...
JOIN on keys that don't have the same value
So in this case, I used a subquery to get the initial results, and then used a join. SELECT table1.nisinfo.* FROM table1.nisinfo JOIN (SELECT distinct(fqhn) FROM table2.hosts WHERE package = 'bash') AS FQ ON ((SUBSTRING_INDEX(FQ.fqhn, '.', 1)) = table1.nisinfo.shortname); ...
delete the output of a join (record in multipe tables)
sql,postgresql,join,cloudfoundry,cascading-deletes
You may use WITH construction. with _deleted_service_instances as ( delete from service_instances where guid = 'daf67426-129b-4010-832c-692bcfe98f62' returning id ) , _deleted_service_instance_operations as ( delete from service_instance_operations op using _deleted_service_instances i where op.service_instance_id = i.id ) , _deleted_service_bindings as ( delete from service_bindings b using _deleted_service_instances i where b.service_instance_id = i.id...
Best way to serialize a JOIN SQL query to JSON
php,mysql,json,codeigniter,join
That's a normal practice to sort result from SQL with PHP, so You're on the right way. $result = array(); foreach($query->result_array() as $row) { $result[$row['id']] = array( 'id'=>$row['id'], 'name'=>$row['name'], 'price'=>isset($result[$row['id']]['price']) ? array_push($result[$row['id']]['price'],$row['price']) : array($row['price']) ); } $this->output ->set_content_type('application/json') ->set_output(json_encode(array('products'=>array_values($result)))); ...
Mysql count and return just one row of data
mysql,join,count,subquery,having
Please give this query a shoot SELECT COUNT(DISTINCT(u.id)) AS users_count FROM users AS u INNER JOIN ( SELECT user_id, COUNT(DISTINCT profile_option_id) AS total FROM profile_answers WHERE profile_option_id IN (37,86,102) GROUP BY users.id HAVING COUNT(DISTINCT profile_option_id) = 3 ) AS a ON a.user_id = u.id If you have lots of data...
Mysql how to reduce rows by max datetime and group by non-uniqe id
Is this what you are looking for? SELECT <choose your columns here> FROM Orders o LEFT JOIN XrefOrdersStatuses x ON x.xos_order_id = o.order_id LEFT JOIN (SELECT xos_order_id, MAX(xos_datetime) AS maxdate FROM XrefOrdersStatuses GROUP BY xos_order_id ) xmax ON xmax.xos_order_id = x.xos_order_id AND xmax.maxdate = x.xos_datetime; The LEFT JOIN is only...
Search table based on linked text field from second table
In your sql condition may be wrong i think, i modified that sql. select p.* FROM products p JOIN strings s ON p.title = s.id and s.language_en = "Product name" you can execute and see the result. Thank you....
Rotate columns to rows for joined tables
If your columns are fixed, you can do this with group by + case + max like this: select fname, lname, email, max(case when name = 'utm_medium' then value end) as utm_medium, max(case when name = 'utm_term' then value end) as utm_term from lead l join leadcustom c on l.id...
PL/SQL: Join between two tables error [on hold]
Your cursor does select d.dlocof the table dept d, but it is named loc in your screenshot. CURSOR staff_cursor IS SELECT e.empno, e.ename, e.sal, d.dname, d.loc -- ... ...
Mysql query using subselects needs to use joins or exists
mysql,sql,performance,join,subquery
Whatever comments you supply to this answer, I will continue with helping try revision for you, but was too much to describe in a comment to your original post. You are looking at services within a given UNIX time range, yet your qualifier on service_id in sub-selects is looking against...
Can we perform joins on tables in two different projects in BigQuery?
Yes, you certainly can. You need to qualify the table name with project name, i.e. projectname:dataset.table Here is an example of my joining one of my tables against table in publicdata project: select sum(a.is_male) from (select is_male, year from [publicdata:samples.natality]) a inner join (select year from [moshap.my_years]) b on a.year...
Sql: Selecting from other tables
mysql,sql,database,join,foreign-keys
SELECT * FROM Player INNER JOIN Stats ON Player.SSN = Stats.SSN WHERE Player.DOB >= '1994-01-01' If you just want specific fields then specify these instead of SELECT *...
How to create a SELECT query FROM “TABLE1 AND TABLE2”
UNION ALL SELECT field1, field2, field3 FROM table1 WHERE condition UNION ALL SELECT field1, field2, field3 FROM table2 WHERE condition; Or to simplify your WHERE condition SELECT * FROM ( SELECT field1, field2, field3 FROM table1 UNION ALL SELECT field1, field2, field3 FROM table2 ) WHERE condition; ...
SQL how to use multiple joins on the same table
Try it the other way round. Start with the info table and then LEFT JOIN multiple times to antwoorden: select i.id,i.start_bt1,i.start_bt2, a1.ant as "bt1_vl1", a2.ant as "bt1_vl2", a3.ant as "bt2_vl1", a4.ant as "bt2_vl2" from info i left join antwoorden a1 on a1.id = i.id and a1.vl=1 and a1.bt=1 left join...
Joining tables on two fields
This is going to be your best query (It will run queries once, and then join tables on their indices): SELECT m.`msg_id`, su.`first_name` AS `sender_name`, ru.`first_name` AS `recipient_name`, m.`msg_body` FROM `tblMessages` m LEFT JOIN `tblUsers` su ON m.`sender_id` = su.`user_id` LEFT JOIN `tblUsers` ru ON m.`recipient_id` = ru.`user_id`; When in...
Finding unmatched rows of 2 tables in SQL
Easier to verify if we build some DDL and fillwith sample data, but I think this would do it. It takes a full join to find records with a partial match and then filters out records with a full match. sqlfiddle.com CREATE TABLE Table1 (ID INT, FPRICE INT, FPRODUCT CHAR(1))...
Optimization - is union the best way to go in this case?
sql-server,join,optimization,union
Well first of all, you can use UNION ALL, which will leave out the duplication check. This will be much faster. Another suggestion is the IN() in your first SELECT. This could cause long runtimes if your subquery returns many rows. I would suggest to redesign it from this: select...
convert query to use of joins
mysql,join,database-normalization
Seems you missed one condition: hole_scores.user_id = users.id which you should add as ... INNER JOIN users ON users.id = score_card_user.user_id AND hole_scores.user_id = users.id .... ...
Joining two Pandas DataFrames does not work anymore?
short story: as pointed out in the comment already, i was comparing strings with integers. long story: i didn't expect python to parse the id-columns of two input csv files to different datatpyes. df1.id was of type Object. df2.id was of type int. and i needed to find out why...
Powershell Join Path returns array
Your variable $path contains an array. PS C:\> $path = 'C:\Temp' PS C:\> $res = Join-Path $path 'file.txt' PS C:\> $res.GetType().FullName System.String PS C:\> $res C:\Temp\file.txt PS C:\> $path = 'C:\Temp', 'C:\Windows' PS C:\> $res = Join-Path $path 'file.txt' PS C:\> $res.GetType().FullName System.Object[] PS C:\> $res C:\Temp\file.txt C:\Windows\file.txt...
Unique movies by UNION the results of two join, MYSQL
Distinct can be run inside a count in mysql which is pretty handy. select Count(Distinct answer) from ( SELECT member_CROWD.worker_Id, member_CROWD.Unreliable, Answer_CROWD.qId, Answer_CROWD.answer FROM member_CROWD JOIN `Answer_CROWD` ON member_CROWD.worker_Id = Answer_CROWD.worker_Id WHERE member_CROWD.Unreliable = '0' AND Answer_CROWD.qId = 'q8' GROUP BY Answer_CROWD.answer UNION SELECT member.mem_id, member.Unreliable, Answer.qId, Answer.answer FROM member...
SQL Join Views - Duplicate Field
sql-server,tsql,join,view,alias
You have two instances of cauditnumber at position 1 and 3, you need to alias or remove one. CREATE VIEW KFF_Sales_Data_Updated AS SELECT CustSalesUpdated.cAuditNumber -- HERE ,CustSalesUpdated.Account ,CustSalesUpdated.cAuditNumber --HERE ,CustSalesUpdated.Name ,StkSalesUpdated.cAuditNumber as AuditNumber1 ,StkSalesUpdated.Code ,StkSalesUpdated.Credit ,StkSalesUpdated.Debit ,StkSalesUpdated.Description_1 ,StkSalesUpdated.Id ,StkSalesUpdated.ItemGroup ,StkSalesUpdated.Quantity ,StkSalesUpdated.Reference ,StkSalesUpdated.TxDate FROM...
left join table, find both null and match value
Try FULL OUTER JOIN. This is the sqlfiddle. It will produce the op you are expecting SQLFiddle select t1.years, t1.numOfppl, t2.years, t2.numOfppl from t1 full outer join t2 on t1.years=t2.years ...
Complex SQL with Multiple Joins
What I think you should take note of here is that each post has a department and a postType. If you take a step back, you can select all posts that belong to a certain department and a certain postType like this: SELECT p.* FROM posts p JOIN department d...
mysql query retrieve too slow from 10,000 of data (Query Optimizing)
php,join,mysqli,subquery,left-join
ISSUE The page is slowing down (3-5 mins instead of seconds) in mysql queries which has multiple joins and sub-queries to retrieve massive amount of data (~10,000) in tables. SOLUTION - Used Index to the columns Added indexes and done various search queries, It is retrieving better. NOTES Indexes...
PostgreSQL get latest rows/events for all users
sql,join,greatest-n-per-group,amazon-redshift
You can do this with Postgres' DISTINCT ON: select distinct on(userId) userId, tstamp, event from events order by userId, tstamp desc; For Redshift, you might be able to this variant from one of my previous answers: select userId, tstamp, event from ( select userId, tstamp, event, row_number() over (partition by...
Database Multiple select Query , Unable to Retrieve Desired Data
sql,sql-server,database,select,join
I think you want this kind of scenario Retrieve Drug_ID from Given Criteria (Brand_Name , Drug_Id, Generic Name) Select Record on base of That Retrieved Drug_ID SELECT distinct(Company_List.Company_Name), Drug_Details.* from Drug_Details , Company_List where Company_List.Company_ID=Drug_Details.Company_ID and Drug_Details.Drug_ID in ( select distinct(Drug_Details.Drug_ID) from Drug_Details where Drug_Details.Brand_Name like '%arnica%' or Drug_Details.Drug_ID in...
MySQL - Querying for unread messages along with mail messages
Lasted email recieved and count of unread (recieved). SELECT e.MAIL_NO, e.BIZ_ID, e.FROM_ADD, e.TO_ADD, e.EMAIL_SUBJECT, DATE_FORMAT(e.UPDATED_DATE,'%d %b %y, %I:%i %p') AS DATE, e.MAIL_STATUS, CONCAT(ufrom.USER_FIRST_NAME,' ',ufrom.USER_LAST_NAME) AS U_NAME,if(UNREAD_MESSAGE_COUNT is null,0,UNREAD_MESSAGE_COUNT) FROM EMAIL e LEFT JOIN USER_CONFIG ufrom ON ufrom.USER_ID = e.TO_ADD left join (SELECT COUNT(*) AS UNREAD_MESSAGE_COUNT,TO_ADD FROM EMAIL_MESSAGE inner join EMAIL...
SQL - How to only show the row with the greatest date value based on ID?
Use windows functions: SELECT * FROM( SELECT Laptops.Laptop_ID, Laptops.Model_Name, ... Users.Firstname + Users.Lastname AS Name, Loans.Date_Loaned, row_number() over(partition by Laptops.Laptop_ID order by Loans.Date_Loaned desc) rn FROM Users INNER JOIN Loans ON Users.User_ID = Loans.User_ID RIGHT OUTER JOIN Laptops ON Loans.Laptop_ID = Laptops.Laptop_ID) t WHERE rn = 1 ...
Table update based on match/nomatch
You'll want to use a MERGE. It allows you to join two tables and specify how to update the values if they match. The general structure of a MERGE statement looks like: MERGE INTO driver_table USING other_table ON ( driver_table.column1 = other_table.column1 AND driver_table.column2 = other_table.column2 AND ... ) WHEN...
mysql - Select unique column based on max value of another column in a different table
Use MAX and GROUP BY SELECT MAX(m.kw), t.category FROM model m INNER JOIN type t ON m.type_id = t.id GROUP BY t.category OUTPUT MAX(m.kw) category 10 1 7 2 SQL FIDDLE: http://sqlfiddle.com/#!9/5d0df/5/0...
Activerecord Rails 4 perform something like a join that still returns rows that don't have the association
actionscript-3,ruby-on-rails-4,join,left-join
It seems that LEFT OUTER JOIN is what I am looking for. I created scopes in the models like this: class Artist < ActiveRecord::Base has_many :album_artists has_many :albums, :through => :album_artists scope :joins_albums, -> {joins('LEFT OUTER JOIN "album_artists" ON "album_artists"."artist_id" = "artists"."id" LEFT OUTER JOIN "albums" ON "albums"."id" = "album_artists"."album_id"')}...
3 Table JOIN with group by doesn't work
You need to include the month in the second join condition. SELECT * FROM product_data A LEFT JOIN (SELECT prod_id, sale_date, sum(sales) FROM sales_data group by prod_id, MONTH(sale_date) ) AS B ON A.prod_id=B.prod_id RIGHT JOIN (SELECT prod_id, exp_date, media_expenditure --don't need to SUM since it's only 1 row per month...
Join table comment in rails 4 migration
ruby-on-rails,ruby-on-rails-4,join,migration,has-and-belongs-to-many
The create_join_table command in migrations is new in Rails 4. This: create_join_table :questions, :sub_topics do |t| # other commands end is essentially shorthand for this: create_table :questions_sub_topics do |t| t.integer :question_id, null: false t.integer :sub_topic_id, null: false # other commands end You can add additional columns in the block; you...
SQLITE inner join windows phone 8
c#,.net,sqlite,join,windows-phone-8
Create a class which has properties from both the class and use that classes. In your case it will have ITMID_PK,ITMNAME, description ,iCON and PRICE. Just keep the properties name same as column name. That class can be a separate class or Base class for these two classes. Edit: You...
Is there a better way to write this query involving a self select?
sql,postgresql,join,aggregate-functions
Query The query is not as simple as it looks at first. The shortest query string does not necessarily yield best performance. This should be as fast as it gets, being as short as possible for that: SELECT p.username, COALESCE(w.ct, 0) AS won, COALESCE(l.ct, 0) AS lost FROM ( SELECT...
Mule Mongo Connector to produce INNER JOIN results
The problem comes from the fact you store string representation of the brands in brandResponses, thus you collect them as strings in the final JSON. Note that for producing JSON, there's no big gain in using Groovy. Building Maps/Lists with MEL and serializing them to JSON Objects/Arrays with the json:object-to-json-transformer...
ONLY display certain rows from an inner joined table using a certain colum as a parameter from one of the inner joined tables
If I understood correctly this should be what you're looking for SELECT A.UserName, A.[Email ID], A.[Supervisor Email ID] FROM A INNER JOIN B ON A.UserCode = B.UserCode WHERE B.ACTIVE_FLAG = 'Y' ...
MYSQL INNER JOIN unexpected result
This should gives you the correct result: select * from TrackingDetails as a join ( SELECT tr.trackNo AS 'TrackNo', MAX(trD.DatePosted) AS 'Date_Time' FROM Tracking AS tr INNER JOIN TrackingDetails AS trD ON tr.trackNo = trD.trackNo WHERE tr.ClientID='client01' AND trD.trackNo IN ('xx000001','xx000002','xx000003') AND trD.DatePosted IS NOT NULL AND trD.Status IN (...
LEFT JOIN with condition is not returning data desired
You need to move the condition in the where clause to the on clause. When no rows match, then the column has a value of NULL and the WHERE condition fails: SELECT B.bookTitle, L.lendBorrowerName AS takenName, count(L.lendStatus) AS taken FROM books as B LEFT JOIN lends AS L ON B.bookId...
irc server response to JOIN comment
python,join,network-programming,irc,hexchat
151.232.114.48 is server address that you are trying to connect.
How can I select same column value as different column from mysql table with join?
You have to join communication twice, depending on medium. This should do the job (untested): SELECT con.contact_id, con.f_name, con.l_name, com1.value AS phone_number, com2.value AS email_address, con.creation_date FROM contact con LEFT JOIN communication com1 ON com1.contact_id = con.id AND com1.medium = 'PHONE' LEFT JOIN communication com2 ON com2.contact_id = con.id AND...
SQL Update with a Group by Statement not working
sql-server,join,group-by,sum,sql-update
Try this: update w set hist_amt_due = d.s from @work w join (select pmt_customer_no, sum(isnull(due_amt, 0)) s from @due_cte group by pmt_customer_no)d on w.pmt_customer_no = d.pmt_customer_no ...
MySQL: Get all Items and associated tags with just one request
This can easily be done with a join, all you have to do is use the item_id as the related column: SELECT i.id, i.name, t.name FROM items i JOIN tags t ON t.item_id = i.id; If you want to see all tags for an item grouped together, you can consider...
MYSQL: doing a select to filter using the ID of 2 tables
If the column is stored as a date, then you would use: SELECT * FROM wp_simple_login_log l INNER JOIN wp_users u ON u.id = l.uid WHERE l.time >= date_sub(curdate(), interval 3 month); If it is stored as a string, then do an explicit conversion: SELECT * FROM wp_simple_login_log l INNER...
join two data tables and use only one column from second dt in R
In order to perform a left join to df1 and add H column from df2, you can combine binary join with the update by reference operator (:=) setkey(setDT(dt1), A) dt1[dt2, H := i.H] See here and here for detailed explanation on how it works With the devel version (v >=...
Query from 3 tables
SELECT u.* FROM tblBridge b JOIN tblUsers u ON u.ID = b.tblUsersID JOIN tblAssignments a ON a.ID = b.tblAssignmentsID WHERE u.isAdmin = 'yes' AND a.name = 'searched assignment' It's MANY-TO-MANY Relation so you need select many-to-many table and join it to assigments and users also put in where condition for...
How to count users in JOINed models?
python,django,join,django-models,django-queryset
from datetime import date def add_years(d, years): try: return d.replace(year = d.year + years) except ValueError: return d + (date(d.year + years, 1, 1) - date(d.year, 1, 1)) today = datetime.date.today() ago18 = add_years(today, -18) ago25 = add_years(today, -25) # < 18 User.objects.filter(profile__birthdate__gt=ago18) # 18 <= and < 25 User.objects.filter(profile__birthdate__lte=ago18,...