>>Probably I don't understand the type of query you are doing. If you have all the values hardcoded then go with that.
>
>Here is an example:
>
>

>SELECT Thread.Numero
> FROM Thread
> WHERE Thread.NoStatus=1 AND (Thread.NoClient=1 OR Thread.NoClient=2)
>

>
>That specific one can benefit of a compound index on NoStatus+NoClient.
>
>

>SELECT Thread.Numero
> FROM Thread
> WHERE Thread.NoStatus=1 AND
>  EXISTS (SELECT ForumCli.Numero FROM ForumCli WHERE ForumCli.NoMember=1 AND (ForumCli.NoClient=1 OR ForumCli.NoClient=2))
>

>
>That specific one uses the EXISTS to see if the child table has records.

I am afraid EXISTS wouldn't help with those hardcoded constants. I meant when there is a relation between the tables. Go with IN or OR approach.