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A002
A003
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SQL code:
--²Î¿¼:
--ÏÂÃæµÄ´úÂëÉú³É³¤¶ÈΪ8µÄ±àºÅ£¬±àºÅÒÔBH¿ªÍ·£¬ÆäÓà6λΪÁ÷Ë®ºÅ¡£
--µÃµ½Ð±àºÅµÄº¯Êý
CREATE FUNCTION f_NextBH()
RETURNS char(8)
AS
BEGIN
RETURN(SELECT 'BH'+RIGHT(1000001+ISNULL(RIGHT(MAX(BH),6),0),6) from tb WITH(XLOCK,PAGLOCK))
END
GO

--ÔÚ±íÖÐÓ¦Óú¯Êý
CREATE TABLE tb(
BH char(8) PRIMARY KEY DEFAULT dbo.f_NextBH(),
col int)

--²åÈë×ÊÁÏ
BEGIN TRAN
INSERT tb(col) VALUES(1)
INSERT tb(col) VALUES(2)
INSERT tb(col) VALUES(3)
DELETE tb WHERE col=3
INSERT tb(col) VALUES(4)
INSERT tb(BH,col) VALUES(dbo.f_NextBH(),14)
COMMIT TRAN

--ÏÔʾ½á¹û
SELECT * from tb
/*--½á¹û
BH col
---------------- -----------
BH000001 1
BH000002 2
BH000003 4
BH000004 14
--*/


SQL code:
create table tb
(id int identity,
name varchar(10),
co
code as 'BH'+right('0000'+cast(id as varchar),5))
go
insert tb(name) select 'A'
union all select 'B'
union all select 'C'
union all select 'D'

select * from tb

drop table tb

/*
id


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