insert data to SQLite with button_click in C#
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...
SQL: Foreign Key With multiple child values
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...
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 ...
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...