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SQL: Foreign Key With multiple child values

php,mysql,sql,database-table

You need to create a third table, referred to as a "join table". users ( id, name ); groups ( id, first_name, last_name ); groups_to_users ( user_id, group_id ); Then create an entry in the groups_to_users table for every group a user is a member of (or, you could say...

insert data to SQLite with button_click in C#

c#,sqlite,database-table

I've figure it out! I change the New property to False and eliminate sqlite_Cmd.CommandText = "CREATE TABLE test (id integer primary key, text varchar(100));"; sqlite_Cmd.ExecuteNonQuery(); then the data could be inserted correctly. However, because I remove the part which will create the table, the table must be created before I...

Saving lists in django models

python,django,django-models,database-table

Maybe you should take a look into the django docs You would have to do something like that class User(models.Model): #Your implementation of user class Location(models.Model): #.... user = models.ForeignKey(Location) It is then possible to access the locations like this: u = <some_query_for_a_user> locations = u.location_set ...

SQL count rows in a table

sql-server,count,rows,database-table

Yes, SELECT COUNT(*) FROM TableName

Using HAVING to search for part of a string

sql,database,having,database-table

Your syntax would not work in most databases. It would happen to work in MySQL, because MySQL allows having clauses for non-aggregation queries. Even in MySQL, the clause would do nothing, because "15" is simply a number. In a boolean context, non-zero numbers are interpreted as "true" and zeros as...