SQL Update多表联合更新的方法

有些时候我们需要同时更新多个表中的数据那么就需要用到下面方法了：

(1) sqlite 多表更新方法

//----------------------------------

update t1 set col1=t2.col1

from table1 t1

inner join table2 t2 on t1.col2=t2.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 table1 set col1=(select col1 from table2 where col2=table1.col2)

update ta_jbnt_tzhd_pht_Area_xiang set t1=(select sys_xzqhdm.name from sys_xzqhdm 

 where t2=sys_xzqhdm.code) 

(2) SQL Server 多表更新方法

//----------------------------------

SQL Server语法: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 a set a.gqdltks=b.gqdltks,a.bztks=b.bztks from

landleveldata a,gdqlpj b where a.GEO_Code=b.lxqdm

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);

(3) Oracle 多表更新方法

Oracle语法:

UPDATE updatedtable SET (col_name1[,col_name2...])= (SELECT

col_name1,[,col_name2...] FROM srctable [WHERE where_definition])

Oracel 示例:

update landleveldata a set (a.gqdltks, a.bztks)= (select b.gqdltks,

b.bztks from gdqlpj b where a.GEO_Code=b.lxqdm)

(4) MySQL 多表更新方法

MySQL语法:

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

[WHERE where_definition]

MySQL 示例:

update landleveldata a, gdqlpj b set a.gqdltks= b.gqdltks, a.bztks=

b.bztks where a.GEO_Code=b.lxqdm