MySQL : SELECT results from four different tables in one query?

Your query looks about right, unless you also want all rows, regardless of the existence of a contract or phone . In this case, you'll want to use OUTER JOIN or LEFT JOIN instead of INNER JOIN.

INNER JOIN only returns rows where at least one match in both joined tables is available. The problem is that you are joining 4 tables together. So there could be more records (than 1) if you join only specials with ugets but these records get filtered out if you join with your other tables.

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