Re: subselect in CHECK constraint?

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>     CHECK (testconstraint(a, b))

Uhhh. I get no errors, but it dosen't work, either. Consider:

CREATE FUNCTION testconstraint(int,int) RETURNS bool AS '
BEGIN
    RETURN (select sum(a) FROM test WHERE b = $2) < 1000;
END;
' LANGUAGE 'plpgsql';

CREATE TABLE test (a int, b int, CHECK (testconstraint(a,b)));

INSERT INTO test (a,b) VALUES (1100, 1);

SELECT * FROM test;

Yielding:

  a   | b
- ------+---
 1100 | 1
(1 row)

which clearly does not satisfy the constraint.

Ian
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=nik7
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