TO_CHAR():
CAST(123 AS CHAR(3))TO_NUMBER():
cast('123' as SIGNED INTEGER)cast函数详解:
http://dev.mysql.com/doc/refman/5.0/en/cast-functions.html
CAST(123 AS CHAR(3))TO_NUMBER():
cast('123' as SIGNED INTEGER)cast函数详解:
http://dev.mysql.com/doc/refman/5.0/en/cast-functions.html
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