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数据库集合操作

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Release： 2016-06-07 17:38:39
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实际环境中使用最多往往是UNION与UNION ALL（这算一种操作吧），其他两种操作往往有为了效率有替代方法（使用join）。 Microsoft SQL Srver 2012 Oracle Database 12c(12.1) #i1035612 值得注意的是集合减运算（即第一个集合被第二个集合减）EXCEPT（SQL ser

实际环境中使用最多往往是UNION与UNION ALL（这算一种操作吧），其他两种操作往往有为了效率有替代方法（使用join）。

Microsoft SQL Srver 2012

Oracle Database 12c(12.1)

#i1035612

值得注意的是集合减运算（即第一个集合被第二个集合减）EXCEPT（SQL server），

ISO/ANSI 92标准中的表述

#non-join query expression

About SQL

有空应该写个关于标准SQL 的演化过程。

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