Re: Table name as a variable in SELECT query

Andrey Fokin <affox(at)myway(dot)com> wrote:

> Hi,
> please advise is possible in SELECT query use variable as a table name?
>
> I would like to have for example something like:
>
> CREATE OR REPLACE FUNCTION test_name (tb varchar) RETURNS int AS $$
>
> DECLARE
>
> ......
>
> BEGIN
> SELECT * FROM $1;
> ........
>
> Will be grateful for any idea about.

Yes, it is possible, with dynamic sql. You have to build a string that
contains your query, and then execute (it's a command in pl/pgsql) that
string. Read more:

http://www.postgresql.org/docs/current/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN

Andreas
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