I'm glad to hear you got it working.
In explanation to my response:
the pg_class internal table lists all the relationships in the database.
relkind='r' means that the relation you are looking for is a table (relation), I believe that will also find views.
relname is the name of the object if your table is called parts
select * from pg_class where relkind='r' and relname='parts' will give you the pg_class record for the table if it exists and nothing if it doesn't.
you could also do a select count(*) or select 1 In any case if there is a resultset the table exists and if there is no resultset the the table does not.
Using the pg_tables view is a better idea in any case, as it is cleaner.
Sim
Hi Sim
Thanks for your response. I had it working from a previous post by Adam Tomjack.
<snip>
-- A list of tables:
SELECT schemaname, tablename FROM pg_tables;
-- Returns true if a table exists:
SELECT count(*)>0 FROM pg_tables
WHERE schemaname='...' AND tablename='...'
</snip>
Your response does not work for me. Perhaps you can explain the posted command
<snip>
* from pg_class where relkind='r' and relname=your_tablename
</snip>
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Kind Regards,
Shaun Clements
-----Original Message-----
From: Sim Zacks [mailto:sim@compulab.co.il]
Sent: 10 March 2005 01:24 PM
To: pgsql-general@postgresql.org
Subject: Re: [GENERAL] pl sql to check if table of table_name exists
i mean select * from pg_class where relkind='r' and relname=your_tablename
select your_tablename from pg_class where relkind='r'
Hi
Hate to ask, but it isnt obvious to me from the documentation.
How do I perform a query in pgplsql, to check it a table exists of a particular name.
Thanks in advance
Kind Regards,
Shaun Clements
