Обсуждение: SQL Query to get Column constraints
Hi there, I have been through the postgres faq's, and read through the describe.c file. I can't seem to solve my problem. I am building an automatic file writer, that gives me information about each of my tables. What I need to know, is how to find out if a column is a primary, or part of a primary key. I need to do this using sql. I am used to oracle, whose structure is different. Can anyone help me. Whiel I am at it, If I can dynamically find out if a column has a sequence attached to it, that would also be useful. Regards Steve
"Steve" <svanspal@bigpond.com> writes: > What I need to know, is how to find out if a column is a primary, or part of > a primary key. I need to do this using sql. In 7.3 this is pretty easy: look in the pg_constraint table for a 'p' constraint for the table. If you find one, 'conkey' lists the column numbers of the key columns. In prior versions you'd need to look in pg_index instead. (Actually the pg_index method still works, but it's messier.) See the "System Catalogs" chapter of the documentation. regards, tom lane