有些時候我們需要同時更新多個表中的數據那麼就需要用到下面方法了：
(1) sqlite 多表更新方法
復制代碼 代碼如下:
//----------------------------------
update t1 set col1=t2.col1
from table1 t1
inner join table2 t2 on t1.col2=t2.col2
這是一個非常簡單的批量更新語句 在SqlServer中支持此語法 sqlite中卻不支持
sqlite中可轉換為 如下語法
復制代碼 代碼如下:
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
復制代碼 代碼如下:
//----------------------------------
SQL Server語法: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:
復制代碼 代碼如下:
update a set a.gqdltks=b.gqdltks,a.bztks=b.bztks from
landleveldata a,gdqlpj b where a.GEO_Code=b.lxqdm
access數據庫多表更新方法
復制代碼 代碼如下:
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語法:
復制代碼 代碼如下:
UPDATE updatedtable SET (col_name1[,col_name2...])= (SELECT
col_name1,[,col_name2...] FROM srctable [WHERE where_definition])
Oracel 示例:
復制代碼 代碼如下:
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語法:
復制代碼 代碼如下:
UPDATE table_references SET col_name1=expr1 [, col_name2=expr2 ...]
[WHERE where_definition]
MySQL 示例:
復制代碼 代碼如下:
update landleveldata a, gdqlpj b set a.gqdltks= b.gqdltks, a.bztks=
b.bztks where a.GEO_Code=b.lxqdm
