更正一下:select T1.A,T1.B from T T1 join T T2 on T1.A=T2.A Group By T1.A , T1.B Having count(T1.A)>1

benbendan (笨笨蛋)
2001-11-18 -04:00
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Back To Topic: 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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