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[mysql] compare 2 columns insert a third 1

Discussion in 'Databases' started by darkvisje, Oct 14, 2014.

  1. #1
    Dear all,
    I've a little problem with a mysql statement. I want to insert a new column, with a record from an other table:


    userid (new column) -> int, default value 0

    What i want to do is compare table1.username with table2.name and insert table1.id into table2.userid if they match. And if there is no match, the userid table can be empty.

    Its a query I run 1 time to get the tables oke

    Someone that can help me with the statement to accomplish this?
    Solved! View solution.
    darkvisje, Oct 14, 2014 IP
  2. #2
    You should be able to use an inner join to accomplish this. Inner join will only return rows where the condition in the join is satisfied.

    Something like this (untested):
    UPDATE table2
    INNER JOIN table1 ON table2.name = table1.username
    SET table2.userid = table1.id;
    jestep, Oct 14, 2014 IP
  3. darkvisje

    darkvisje Well-Known Member

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    That was it! need to use a inner join! thanks m8
    darkvisje, Oct 14, 2014 IP