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Editorial Team
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Asked: 2026-06-16T15:11:34+00:00

It shows each row twice… I wrote it to pick some rows from different

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It shows each row twice… I wrote it to pick some rows from different tables, it shows what I want but it shows those rows twice, each. why ?

SELECT
   tbluser.fullname, tbluser.email, tblJobAdv.advtitle, tblPersonalInfo.country, 
   tblPersonalInfo.city, tblJobOffer.digitalsignature 
FROM
   tblUser 
LEFT JOIN
   tblPersonalInfo ON tblUser.userid = tblPersonalInfo.userid
LEFT JOIN
   tblApplication ON tblApplication.userid = tblUser.userid 
LEFT JOIN
   tblJobAdv ON tblJobAdv.advid = tblApplication.advid
LEFT JOIN
   tblJobOffer ON tblUser.userid = tblJobOffer.userid
WHERE
   tblJobAdv.userId IN (SELECT userid FROM tblUser WHERE email = 'h@y.com')
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1 Answer

  1. Editorial Team

    using ‘group by’ or ‘distinct’ makes your query slow and inefficient.
    I think you would better finding duplicated rows from other tables like tblJobAdv,
    and give some more ‘where condition’ to those tables. 

    SELECT tbluser.fullname, tbluser.email, tblJobAdv.advtitle, tblPersonalInfo.country, 
   tblPersonalInfo.city, tblJobOffer.digitalsignature 
FROM
   tblUser 
LEFT JOIN
   tblPersonalInfo ON tblUser.userid = tblPersonalInfo.userid
LEFT JOIN
   tblApplication ON tblApplication.userid = tblUser.userid 
LEFT JOIN
   tblJobAdv 
   ON tblJobAdv.advid = tblApplication.advid
   AND tblJobAdv.isUsable = 'Usable' /* some more where condition example */
LEFT JOIN
   tblJobOffer ON tblUser.userid = tblJobOffer.userid
WHERE
   tblJobAdv.userId IN (SELECT userid FROM tblUser WHERE email = 'h@y.com')
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