Postgres: How is SET NOT NULL "more efficient" than CHECK constraint
41952
Add NOT NULL constraint to large table without table scan
146592
Is there a faster way to get UNION ALL behavior in Postgres?
145673
What does [FROM x, y] mean in Postgres?
10184
Altering a column: null to not null
158985
Can a foreign key be NULL and/or duplicate?
44726
What is the difference between HAVING and WHERE in SQL?
124471
Comparing nullable column values using "IS NULL" versus "= NULL"
12021
What is an equivalent of EXCEPT(in PostgreSQL) in MySQL?
16236
Is it possible to enforce unique values in a column, excluding nulls?
71370
In Postgres txid_current() should return biginteger but instead an integer is returned
94883
Why does comparing a SQL date variable to null behave in this way?
58229
Is a table without a primary key normalized?
26856
How do I specify unique constraint for multiple columns in MySQL?
89905
Have I actually found a real bug in PostgreSQL?
85115
How do you write a case insensitive query for both MySQL and Postgres?
41314
Is there a REAL performance difference between INT and VARCHAR primary keys?
13921
How to reset postgres' primary key sequence when it falls out of sync?