Is 'LEFT OUTER JOIN' equivalent to 'JOIN' in Microsoft SQL
在这个msdn页面上,它显示这些是相等的;
LEFT OUTER JOIN or LEFT JOIN
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我的问题是,在MSSQL中
1 | JOIN |
也相当于
1 | LEFT JOIN |
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不。
检查这个例子,因为它返回了行,所以我们可以假设它是一个
检查文件:
INNER
Specifies all matching pairs of rows are returned. Discards unmatched rows from both tables. When no join type is specified, this is the default.
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此外,根据本文,join子句的type部分是可选的:
For instance, the entire type-part of the JOIN clause is optional, in
which case the default is INNER if you just specify JOIN.
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For instance, the entire type-part of the JOIN clause is optional, in
which case the default is INNER if you just specify JOIN.
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-源左联接与SQL Server中的左外部联接