【转】sql 关联更新

 

SQL Server
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

Oracle语法: 
UPDATE updatedtable SET (col_name1[,col_name2...])= (SELECT col_name1,[,col_name2...] FROM srctable [WHERE where_definition])
 Oracle示例:
update ou_user u set (u.EMPLOYEEID)= (select d.DEPARTNAME from ou_department d where u.DEPARTCODE= d.CODE)

MySQL
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

转自：xiaoer的博客

原文地址：http://xiaoer021025.blog.163.com/blog/static/81697752200971043657960/