[development] Creative querying

[Ken Winters]

On Nov 23, 2009, at 10:18 AM, Brian Vuyk wrote:
>
> SELECT DISTINCT u.uid, ur.rid FROM {users} u RIGHT JOIN  
> {users_roles} ur ON ur.uid = u.uid WHERE rid = 6 OR rid = 8 OR rid =  
> 5 OR rid = 7 OR rid = 4 GROUP BY uid;
>
> Brian

1) Why are you doing a join when all the info you are selecting is in  
the users_roles table?  If you don't need it for some other reason,  
problem solved.
2) I've found it's generally better to use subqueries (where X in  
(select Y from Z)) rather than join and group.

- Ken Winters
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