> Thanks Patric. He were go:
> 
> select distinct(sal) from bonus where ename like
> 'MARTIN'
>      SAL
> ---------
>     0,00
> 1 row selected
> 
> NB! It makes no difference if I use sal = 0.0

Aye, use IF inside SELECT and UPDATE and not outside. This should do it:
update bonus set sal=1250 where ename like 'MARTIN' and sal=0;


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