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我觉的可以用一个减操作,但好久未用oracle,忘了名字。取出全部记录,然后减A为单一值的记录,行不?

rabbitbug (兔八哥)
云MM的SQL嵌套速度有很大影响,如果记录数一多,虽然简洁.
(#260724@0)
2001-11-14 -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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