Only one truthy bool value for one foreign key in postgre
19736
How to have a one-to-many relationship with a privileged child?
77955
Foreign key not working in MySQL: Why can I INSERT a value that's not in the foreign column?
77984
Changing MySQL primary key when foreign key contraints exist
8924
How do I see all foreign keys to a table or column?
13921
How to reset postgres' primary key sequence when it falls out of sync?
68103
Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints
110522
Insert, on duplicate update in PostgreSQL?
26856
How do I specify unique constraint for multiple columns in MySQL?
149392
Why dropping all foreign keys from a script is not working?
94669
Boolean Evaluation in Apex?
149602
One to at most one relation or multiple null columns?
111130
How to use BOOLEAN type in SELECT statement
39484
Using Transactions or SaveChanges(false) and AcceptAllChanges()?
124005
How to query records having at least one valid child record?
155109
Foreign key constraint may cause cycles or multiple cascade paths?
46694
Foreign key referring to primary keys across multiple tables?
95344
How do I insert a row which contains a foreign key?