Oracle批量更新语句

1.问题描述：对照a表，根据id将name对照着更新b表

2.思路:创建临时表存对照的数据，比如根据id更新name，那么这个临时表存id和name；使用更新语句更新符合条件的数据

3.MSSQL写法:

--创建临时表
SELECT A.FDEPTID,B.FNAME INTO #T FROM T_BD_DEPARTMENT A INNER JOIN T_BD_DEPARTMENT_L B ON A.FDEPTID = B.FDEPTID

--只更新部门维度且设置了部门ID的数据
UPDATE KDY_FA_DEPRECIATION SET FDPPROJECTNAME = #T.FNAME FROM #T,KDY_FA_DEPRECIATION WHERE #T.FDEPTID = KDY_FA_DEPRECIATION.FDPPROJECT
	AND FDPDIMENSION = 'BD_Department' AND FDPPROJECT > 0 

4.ORACLE写法：

--创建会话级临时表存部门对照数据
CREATE GLOBAL Temporary TABLE DEMOTEST
ON COMMIT PRESERVE ROWS
AS
SELECT A.FDEPTID,B.FNAME FROM T_BD_DEPARTMENT A INNER JOIN T_BD_DEPARTMENT_L B ON A.FDEPTID = B.FDEPTID

--只更新部门维度且设置了部门ID的数据
--SELECT FDPPROJECTNAME,FDPPROJECT FROM KDY_FA_DEPRECIATION WHERE FDPDIMENSION = 'BD_Department' AND FDPPROJECT > 0 
UPDATE KDY_FA_DEPRECIATION S SET S.FDPPROJECTNAME = (SELECT B.FNAME FROM DEMOTEST B WHERE S.FDPPROJECT = B.FDEPTID)
WHERE S.FDPDIMENSION = 'BD_Department' AND S.FDPPROJECT > 0