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
