Question

I have 3 tables in a m2m relationship in a mysql database as follows:

tbltest (test_id, testdescription)
tblprofile (profile_id, profiledescription)
tbltestprofile(testprofile_id,test_id,profile_id)

I need to display test_id and description from the test table where I have no matching records in tbltestprofile and where the profile_id = x

I’ve tried various combinations using NOT IN but without the desired results. Can anyone assist?

Answer 1

SELECT test_id
     , testdescription
FROM tbltest AS t
WHERE NOT EXISTS
      ( SELECT *
        FROM tbltestprofile tp 
        WHERE t.test_id = tp.test_id
          AND tp.profile_id = X
      )

---

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Sidenote. It would help if you kept table (and field) names simple and not add the tbl prefix, like test, profile, testprofile. A simple 3-table join you have probably used:

SELECT tbltest.test_id
     , tbltest.testdescription
     , tblprofile.profile_id
     , tblprofile.profiledescription
FROM tbltest
  JOIN tbltestprofile
    ON tbltest.test_id = tbltestprofile.test_id
  JOIN tblprofile
    ON tblprofile.profile_id = tbltestprofile.profile_id
ORDER BY tblprofile.profiledescription

makes me rather dizzy. Wouldn’t it be better like this? Even without aliases:

SELECT test.id              AS test_id
     , test.description     AS test
     , profile.id           AS profile_id
     , profile.description  AS profile
FROM test
  JOIN testprofile
    ON test.id = testprofile.test_id
  JOIN profile
    ON profile.id = testprofile.profile_id
ORDER BY profile.description