Question

$query1 = "SELECT id, ac, aa FROM tbl_ac WHERE ac = ? AND aa = ?";

and

$query2 = "SELECT id, cc FROM tbl_cc WHERE cc = ?";

What is the best equivalent of those two query in just one query? I can’t use INNER JOIN with this because each table doesn’t have any relations.

I just want to verify if ac, aa and cc exists in my database.

Answer 1

If you want one query for this you can do it like this:

SELECT id, ac, aa, NULL as cc FROM tbl_ac WHERE ac = ? AND aa = ?
UNION ALL
SELECT id, NULL, NULL, cc FROM tbl_cc WHERE cc = ?

but I don’t recomend.

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If the queries are not linked in any way, you should do the two queries.