SQLServer多表更新方法：

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 ] ) ]

Oracle 多表更新方法：

UPDATE updatedtable 
SET (col_name1[,col_name2...])= (SELECT col_name1,[,col_name2...] 
FROM srctable [WHERE where_definition])

MySql多表更新方法

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