cobusbo Posted December 27, 2015 Share Posted December 27, 2015 Hi I have 2 tables I need to update according to the value of the 3rd table field currently I do 2 queries but I'm sure there must be a way to make it 1 query query 1 $sql = "UPDATE Room_users INNER JOIN Users2 u ON u.mxitid = Room_users.mxitid SET Room_users.User = u.Username"; query 2 $sql = "UPDATE Rooms INNER JOIN Users2 u ON u.mxitid = Rooms.mxitid SET Rooms.creator = u.Username"; How can I turn this into 1 query? Quote Link to comment https://forums.phpfreaks.com/topic/300023-make-2-update-queries-1/ Share on other sites More sharing options...
Barand Posted December 27, 2015 Share Posted December 27, 2015 Not tested UPDATE Room_users INNER JOIN Users2 u ON u.mxitid = Room_users.mxitid INNER JOIN Rooms u ON u.mxitid = Rooms.mxitid SET Room_users.User = u.Username ,Rooms.creator = u.Username Duplicating the username across three tables is destroying your database normalization. You should store it in one place only (Users) and retrieve it with a join when needed. Quote Link to comment https://forums.phpfreaks.com/topic/300023-make-2-update-queries-1/#findComment-1528655 Share on other sites More sharing options...
cobusbo Posted December 27, 2015 Author Share Posted December 27, 2015 Not tested UPDATE Room_users INNER JOIN Users2 u ON u.mxitid = Room_users.mxitid INNER JOIN Rooms u ON u.mxitid = Rooms.mxitid SET Room_users.User = u.Username ,Rooms.creator = u.Username Duplicating the username across three tables is destroying your database normalization. You should store it in one place only (Users) and retrieve it with a join when needed. getting the following error Connection failed: SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'u' Quote Link to comment https://forums.phpfreaks.com/topic/300023-make-2-update-queries-1/#findComment-1528657 Share on other sites More sharing options...
Solution Barand Posted December 27, 2015 Solution Share Posted December 27, 2015 Sorry, UPDATE Room_usersINNER JOIN Users2 u ON u.mxitid = Room_users.mxitidINNER JOIN Rooms u ON u.mxitid = Rooms.mxitid -- remove the "u" alias on this lineSET Room_users.User = u.Username ,Rooms.creator = u.Username Quote Link to comment https://forums.phpfreaks.com/topic/300023-make-2-update-queries-1/#findComment-1528658 Share on other sites More sharing options...
cobusbo Posted December 27, 2015 Author Share Posted December 27, 2015 Thank you Quote Link to comment https://forums.phpfreaks.com/topic/300023-make-2-update-queries-1/#findComment-1528659 Share on other sites More sharing options...
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