..or..
SELECT @some_variable = constraint_name FROM information_schema.table_c
IF @some_variable IS NOT NULL
begin
'do your stuff here
end
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Question
How to use CASE and EXISTS?
PostgreSQL question...
I want something like this:
CASE WHEN EXISTS(SELECT constraint_name FROM information_schema.table_c
ALTER TABLE "ProductPurchased" DROP CONSTRAINT "FK_ProductPurchased_Custo
END;
But that's not valid SQL.
Do you know a way to do that with valid PostgreSQL SQL?
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Answers
Hi,
You can try this:
First create function:
CREATE OR REPLACE FUNCTION execute(in_sql TEXT) RETURNS void as $_$
BEGIN
EXECUTE in_sql;
RETURN;
END;
$_$ LANGUAGE plpgsql;
then you can do this:
select execute ('ALTER TABLE "ProductPurchased" DROP CONSTRAINT "FK_ProductPurchased_Custo
where exists (
SELECT constraint_name FROM information_schema.table_c
HTH
Dominik
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by: jimhornPosted on 2007-02-25 at 12:43:12ID: 18606056
In SQL you cannot use CASE as a decicion loop, such as...
IF (some criteria) THEN
'do this
else
'do that
end if
Instead, use the SQL IF construct (no THEN or END IF required, but good to surround commands with begin..end)
IF EXISTS(SELECT constraint_name FROM information_schema.table_c
begin
ALTER TABLE "ProductPurchased" DROP CONSTRAINT "FK_ProductPurchased_Custo
end