https://bugzilla.wikimedia.org/show_bug.cgi?id=19523





--- Comment #4 from Roan Kattouw <[email protected]>  2009-07-14 09:00:45 
UTC ---
(In reply to comment #3)
> Could be implemented as a LEFT JOIN against the watchlist table or as a
> separate query. I would opt for the latter option.
> 

I don't think it makes much of a difference: MySQL optimized LEFT JOINs when it
notices you use something like WHERE wl_user IS NULL. Keeping everything in one
query is cleaner.


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