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Comments on: Question 30: Which of of the following UPDATE-statements are valid? http://mysql-qotd.casperia.net/archives/246 mysql 5.0/5.1 questions for learning purposes Fri, 06 Aug 2010 16:56:36 +0000 http://wordpress.org/?v=abc hourly 1 By: urs http://mysql-qotd.casperia.net/archives/246/comment-page-1#comment-36 urs Fri, 26 Feb 2010 19:14:13 +0000 http://mysql-qotd.casperia.net/?p=246#comment-36 <b>   Answers:   a b c d e   All of the updates will work.   b and e do a dependent sub-query and are probably the least effecient. (e is actually an example how not to do it, but valid nevertheless.) c and d use inner joins, each with a different syntax. Statement a works with a sub-query.   </b>
 
Answers:
 
a b c d e
 
All of the updates will work.
 
b and e do a dependent sub-query and are probably the least effecient.
(e is actually an example how not to do it, but valid nevertheless.)
c and d use inner joins, each with a different syntax. Statement a works with a sub-query.
 

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