Question

So i have question:

SELECT worker_ID as widp, DAYS, MAX(ID_WERSJI) max , funcion1 as FUN1,function2 as FUN2,function3 as FUN3,function4 as FUN4,function5 as FUN5
                FROM `grafik201105`
                    WHERE 
                        funcion1 IN ('one','two','three','four','five','six') OR
                        function2 IN ('one','two','three','four','five','six') OR
                        function3 IN ('one','two','three','four','five','six') OR
                        function4 IN ('one','two','three','four','five','six') OR
                        function5 IN ('one','two','three','four','five','six') AND
                        active=1 
                        GROUP BY widp, FUN1,DAYS) as dni

And now i need to get fun1,fun2,fun3,fun4 and fun5 in one column (‘give_me_all’)
AND! in fun1=’one’ replace ‘one’ to ‘first’, if ‘two’ then second, three => third…

i try to use if(fun1=’one’,’first’,fun1) but I think that better solution here is to use CASE but i don’t know exactly how to use it

Answer 1

Well to combine two or more columns into one you just simply do (function1+function2+function3+function4+function5) AS give_me_all, but as I said, the best should would be to make a function for you to replace one to first and it would then go like (change(function1)+change(function2)+change(function3)+change(function4)+change(function5)) AS give_me_all, but writing a function is a more advanced thing. Try reading more here.
Otherwise it will look ugly, but still possible

`((CASE 
     function1 
        WHEN 'one' THEN 'first';
        WHEN 'two' THEN 'second';
  END;)+
  (CASE 
     function2 
        WHEN 'one' THEN 'first';
        WHEN 'two' THEN 'second';
  END;)
  ...) AS give_me_all`

See how bad it looks? Better learn to write your own function 🙂