Question

I have a query like this:

DELETE FROM rules_table
WHERE
    type1 = (
        SELECT type_id
        FROM types_table
        WHERE name = '<some_name>')
OR
    type2 = (
        SELECT type_id
        FROM types_table
        WHERE name = '<some_name>')

Please note that <some_name> is the same in both occurrences

I submit a query from php script and I’d prefer it to be a single request rather then selecting the type_is with one request, parsing the result and submitting the delete request.

And also as far as I know, running the same SELECT statement two times is also a bad idea.

Answer 1

try

DELETE FROM rules_table
WHERE  (
         SELECT type_id
         FROM types_table
         WHERE name = '<some_name>'
       ) in (type1, type2)