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@kayinja.denis

I agree with @neuron.  My only question is are you sure that there is only one record in the table SETTING.  Also, it never hurts to test your sql statement on the database first  just to make sure it works.

As I know, You dont have to be sure, if it 1 or more rows retrieved, to use row() function, it retrieves first row.

You right, better it is better to write sql code and test it in db, and then apply in php code