Comments on: Constraints In PostgreSQL http://blog.charcoalphile.com/2008/03/28/constraints-in-postgresql/ On Databases, Recovery, Tech Thu, 09 Sep 2010 08:35:50 +0000 http://wordpress.org/?v=2.2.1 By: Dan http://blog.charcoalphile.com/2008/03/28/constraints-in-postgresql/#comment-400 Dan Thu, 08 May 2008 17:52:08 +0000 http://blog.charcoalphile.com/2008/03/28/constraints-in-postgresql/#comment-400 <p>This would be of great help.</p> <p>Problem:<br /> I am trying to create a foreign key of one column (Table A) to reference another table which has a primary key of two columns (Table B). The constraint I want to to set is to make sure that every value in my column of Table A corresponds to a such a value in Table B. However, there are duplicate values in Table B's column. Postgres won't let you do select statements in constraint statements. Is there a strategy of workaround to this problem that wouldn't require me to change the schema of Table B?</p> <p>Please email me at ___.</p> <p>Thanks</p> This would be of great help.

Problem:
I am trying to create a foreign key of one column (Table A) to reference another table which has a primary key of two columns (Table B). The constraint I want to to set is to make sure that every value in my column of Table A corresponds to a such a value in Table B. However, there are duplicate values in Table B’s column. Postgres won’t let you do select statements in constraint statements. Is there a strategy of workaround to this problem that wouldn’t require me to change the schema of Table B?

Please email me at ___.

Thanks

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