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Posted by J.O. Aho on 10/07/72 11:46
Piotr wrote:
> I wanto set next max number from 'number' field +1 when I update any
> record. I tryied to do like this:
>
> UPDATE table set number=(select MAX(number)+1 from table) WHERE Id=122
>
> but I got error 1093
>
> How can I do it? It can't be autoincrement. I must be sure if nobody
> else got the same number in the same time.
Which version of MySQL?
You could try
SET @new=(SELECT MAX(t.number) FROM table t); UPDATE table SET VALUE=(SELECT
@new := @new+1) WHERE ID=1;
//Aho
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