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2014年12月14日

MINUS(差集)、INTERSECT(交集)和UNION (ALL)(并集)
摘要： MINUS(差集)代码：WITH A AS (SELECT '1' AS num FROM dual UNIONSELECT '2' AS num FROM dual UNIONSELECT '3' AS num FROM dual UNIONSELECT '4' AS num FROM dual ... 阅读全文
posted @ 2014-12-14 13:52 veygoux 阅读(596) 评论(0) 推荐(0) 编辑