T-SQL 之 多表联合更新

1、 sqlite 多表更新方法

UPDATE tA SET col1=tB.col1
FROM tableA tA INNER JOIN tableB tB ON tA.col2=tB.col2

　　这是一个非常简单的批量更新语句 在SqlServer中支持此语法 sqlite中却不支持，sqlite中可转换为如下语法：

UPDATE tableA SET col1=(SELECT col1 FROM tableB WHERE col2=tableA.col2)

2、SQL Server 多表更新方法

UPDATE { table_name WITH ( < table_hint_limited > [ ...n ] ) | view_name | rowset_function_limited }
SET { column_name = { expression | DEFAULT| NULL } | @variable = expression | @variable = column = expression } [ ,...n ]
{ { [ FROM { < table_source > } [ ,...n ] ]
[ WHERE < search_condition > ] } | [WHERE CURRENT OF { { [ GLOBAL ] cursor_name } | cursor_variable_name } ] }
[ OPTION ( < query_hint > [ ,...n ] ) ]

　　SQL Server示例:

UPDATE tA SET tA.col1=tB.col1,tA.col2=tB.col2
FROM tableA tA,tableB tB
WHERE tA.col3=tB.col3

3、access数据库多表更新方法

x = "update " + DLTB + " a inner join tbarea2 b  on a.objectid=b.FID  set a." + fd_dltb_xzdwmj + "=b.area_xzdw, a." + fd_dltb_lxdwmj + "=b.area_lxdw";
SQLList.Add(x);

4、Oracle 多表更新方法

UPDATE updatedtable
SET (col_name1[,col_name2...])=(SELECT col_name1,[,col_name2...] FROM srctable
        [WHERE where_definition])

　　Oracel 示例:

UPDATE tableA tA SET (tA.col1, tA.col2)=(SELECT tB.col1,tB.col2 FROM tableB tB
					 WHERE tA.col3=tB.col4)

5、MySQL 多表更新方法

UPDATE table_references SET col_name1=expr1 [, col_name2=expr2 ...]
[WHERE where_definition]

　　
MySQL 示例:

UPDATE tableA tA, tableB tB
SET tA.col1=tB.col1, tA.col2=tB.col2
WHERE tA.col3=tB.col4