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Num
6111
6201
6520
65121
60087
46300

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SQL code:
update tb set
num = stuff(num,1,1,'5')
where num like '5%'


SQL code:
update tb
set num=stuff(ltrim(num),1,1,'5')
where ltrim(num) like '6%'


SQL code:
-------------------------------------
-- Author : liangCK Áº°®À¼
-- Comment: СÁº °® À¼¶ù
-- Date : 2009-10-12 19:38:25
-------------------------------------

--> Éú³É²âÊÔÊý¾Ý: @tb
DECLARE @tb TABLE (Num int)
INSERT INTO @tb
SELECT 6111 UNION ALL
SELECT 6201 UNION ALL
SELECT 6520 UNION ALL
SELECT 65121 UNION ALL
SELECT 60087 UNION ALL
SELECT 46300

--SQL²éѯÈçÏÂ:

update @tb set
num = stuff(num,1,1,'5')
where num like '6%'

SELECT * from @tb

/*
Num
-----------
5111
5201
5520
55121
50087
46300

(6 ÐÐÊÜÓ°Ïì)


*/


Ò»ÑùµÄÊÖÎó.½«WHEREµÄ5¸ÄΪ6

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