sql server全连接
时间: 2023-08-28 18:05:38 浏览: 55
全连接(FULL JOIN)是SQL Server中一种连接表的方式,它返回两个表中所有的行,无论是否满足连接条件。在SQL Server中,可以使用CROSS JOIN或者INNER JOIN来实现全连接。
使用CROSS JOIN实现全连接的语法如下:
SELECT select_list
FROM T1
CROSS JOIN T2;
使用INNER JOIN连接多个表实现全连接的语法如下:
SELECT *
FROM Table1
INNER JOIN Table2 ON Table1.column = Table2.column
INNER JOIN Table3 ON Table1.column = Table3.column;
其中,Table1、Table2、Table3是要连接的表,column是连接的列。
另外,还可以使用FULL JOIN关键字来实现全连接,语法如下:
SELECT *
FROM Table1
FULL JOIN Table2 ON Table1.column = Table2.column
FULL JOIN Table3 ON Table1.column = Table3.column;
这样可以连接三个表,并返回所有的行,无论是否满足连接条件。\[1\]\[2\]\[3\]
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