【set_operator】什么意思_英语set_operator的翻译_音标_读音_用法_例句_在线翻译

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set operator

合操作符

oracle中有一类操作符是对集合进行操作的，我们称之为集合操作符(set operator).union(all) 是用来将多个select语句的结果集合进行合并处理。其中union会压缩各个结果集中的重复数据，而union all则不会。

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[计]集合算符

合运算

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Gnuplotis very rich in commandoptionsusing thesetoperator.

gnuplot有许多命令选项，可以通过set操作符使用它们。

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Theotherapproachto matching"bat," "bat," "cat," or"cat" USESthe (brackets) setoperator.

匹配“bat”、“bat”、“cat”或“cat”的另一个方法是使用(方括号)集合操作符。

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UNIONALLis the onlysetoperatorallowed betweenthelastanchormemberandfirstrecursivemember, andwhencombiningmultiplerecursive members.

在最后一个定位点成员和第一个递归成员之间，以及组合多个递归成员时，只能使用UNIONALL集合运算符。

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