Le mer 27/10/2004 à 11:59, Pierre-Frédéric Caillaud a écrit : > > > You can't express it directly with a CHECK constraint but you can do this > : > > - add CHECK( test_array( yourcolumn )) in your table definition > - create function test_array which takes an array and looks if all its > elements are in your table T2, I do something like comparing the length of > the array to SELECT count(1) FROM T2 WHERE key IN array > You can do it other ways but you'll have to use a function. > >
Fine. I got it right after fiddling a little bit. The function is something like: CREATE FUNCTION test_array (smallint[]) RETURNS bool AS ' select case when count(1) = array_upper($1,1) then true else false end from t2 where cle = any($1); ' LANGUAGE SQL; It compares the length of the array to the number of elements actually found in the reference table. -- ======================================= Daniel Savard ======================================= ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly