On Tue, 14 Feb 2006, Amy Thornton wrote: > I am trying to join 3 tables together. > > Table A has 3 fields: sub_id, subject, id > Table B has 3 fields: ref_cat_id, sub_id, ref_cat > Table C has 7 fields: uid, ref_cat_id, etc. > > I am trying to join Table A and B over sub_id and join B and C over ref_cat_id > while pulling in the value of sub_id and ref_cat_id from a php program > > I tried doing it this way: > > select reference.uid from reference, subject_name, ref_cat where > subject_name.sub_id = '45' and ref_cat.ref_cat_id = '3' and > ref_cat.ref_cat_id = reference.ref_cat_id and subject_name.sub_id = > ref_cat.sub_id > > with the '45' and '3' being the values coming from my variables in > PHP. We only have MySql 4.0 so I can't use a subquery.
Hi Amy, I suggest you try the following: SELECT reference.uid FROM reference INNER JOIN ref_cat ON reference.ref_cat_id = ref_cat.ref_cat_id INNER JOIN subject_name ON ref_cat.sub_id = subject_name.sub_id WHERE subject_name.sub_id = 45 AND ref_cat.ref_cat_id = 3; HTH Thomas Spahni -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
