SQL Update多表联合更新的方法

SQL Update多表联合更新的方法

(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