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集合操作
David Liu
Less than 1 minute
#
集合操作
对结果集进行交并差操作
#
INTERSECT
求两个集合的交集
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UNION
求两个集合的并集
默认会去重(但是会影响性能)
UNION ALL可以不去重(性能更好)
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MINUS
求两个集合的差集