Comments on: How to write a lazy UNION in MySQL http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/ Stay curious! Thu, 09 Feb 2012 09:56:43 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Log Buffer #102: a Carnival of the Vanities for DBAs http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15888 Log Buffer #102: a Carnival of the Vanities for DBAs Fri, 20 Feb 2009 21:22:53 +0000 http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15888 [...] Schwartz of xaprb describes how to write a lazy UNION in MySQL. No, it doesn’t deal with posting a complaint about undefended job benefits. Baron explains: [...] [...] Schwartz of xaprb describes how to write a lazy UNION in MySQL. No, it doesn’t deal with posting a complaint about undefended job benefits. Baron explains: [...]

]]> By: Xaprb http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15564 Xaprb Mon, 15 Dec 2008 19:52:59 +0000 http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15564 I should note that this theory has now proven itself in the real world. There's a query of the type select * from (select * from foo, bar, baz order by abc limit 50) as a union (select * from egg, dog, cat order by def limit 50) as b limit 50 It was possible to write this such that if 50 rows were found in the first query, the second one would not run at all. I should note that this theory has now proven itself in the real world. There’s a query of the type

select * from
(select * from foo, bar, baz order by abc limit 50) as a
union
(select * from egg, dog, cat order by def limit 50) as b
limit 50

It was possible to write this such that if 50 rows were found in the first query, the second one would not run at all.

]]> By: Разработка сайтов http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15525 Разработка сайтов Wed, 10 Dec 2008 15:53:41 +0000 http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15525 What with MySQL 6? What with MySQL 6?

]]> By: Dmitry http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15524 Dmitry Wed, 10 Dec 2008 15:52:25 +0000 http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-15524 Creative hack. Respect. Creative hack. Respect.

]]> By: Craig http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-14847 Craig Tue, 01 Jul 2008 17:17:22 +0000 http://www.xaprb.com/blog/2008/06/15/how-to-write-a-lazy-union-in-mysql/#comment-14847 I would typically use a stored procedure to achieve this type of thing without the overhead of 2 trips to the db. I haven't used SPs yet with MySQL -- are they frowned upon? I would typically use a stored procedure to achieve this type of thing without the overhead of 2 trips to the db. I haven’t used SPs yet with MySQL — are they frowned upon?

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