uRaNGaTaNG » values http://www.rngtng.com Featuring Ruby, Rails, Web development, Arduino, Processing, Nabaztag and more... Thu, 12 Jan 2012 10:08:01 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 MySQL: How to swap entires of two columns with just one query http://www.rngtng.com/2009/06/24/mysql-how-to-swap-entires-of-two-columns-with-just-one-query/ http://www.rngtng.com/2009/06/24/mysql-how-to-swap-entires-of-two-columns-with-just-one-query/#comments Wed, 24 Jun 2009 13:16:29 +0000 tobi http://www.rngtng.com/?p=134 Check this out, I found out a really nice way how to swap values of two columns with just one query, using user defined variables. Given a table with two columns a and b. To swap their values in whole, use this query:

UPDATE my_table SET a=@tmp:=a, a=b, b=@tmp;

Done! Isn’t that easy?

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