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http://mysql-qotd.casperia.net/archives/237 mysql 5.0/5.1 questions for learning purposes Fri, 06 Aug 2010 16:56:36 +0000 http://wordpress.org/?v=abc hourly 1 http://mysql-qotd.casperia.net/archives/237/comment-page-1#comment-34 urs Wed, 24 Feb 2010 15:04:40 +0000 http://mysql-qotd.casperia.net/?p=237#comment-34 <b>   Answers:   a c   In general, you can only add a constraint to a table, if the existing data does not violate the constraint. However, with the IGNORE option, any duplicates will be removed while adding primary or unique keys (very useful!).   </b>
 
Answers:
 
a c
 
In general, you can only add a constraint to a table, if the existing data does not violate the constraint. However, with the IGNORE option, any duplicates will be removed while adding primary or unique keys (very useful!).
 

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