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If you change into and B=a.B, you can find different ,but I don't know why

hongri(hongri)
(#261180@0)
Last Updated: 2001-11-14
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闲来无事, 出道ORACLE SQL的题考考大家. 这是在下几个月前工作中遇到的问题, 看似简单, 其实不然.
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