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---SQLʵÏÖÍêÈ«ÅÅÁÐ×éºÏ
create function F_strSpit(@s varchar(200)) returns table
as
return(
select value=substring(@s,i,num)+substring(@s,num-1+j,1)
from (select num=number from spt_values where type='p' and number<len(@s) and number>0)TA,
(select i=number+1 from spt_values where type='p' and number<len(@s)-1)TB,
(select j=number+2 from spt_values where type='p' and number<len(@s)-1)TC
where num-1+j<=len(@s) and j>i )
declare @s varchar(200)
set @s='ABCE'
select * from dbo.F_strSpit(@s) order by len(value),value
/*
value
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
AB
AC
AE
BC
BE
CE
ABC
ABE
BCE
ABCE
£¨ËùÓ°ÏìµÄÐÐÊýΪ 10 ÐУ©
*/
drop function F_strSpit


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¡¡¡¡Ïò±íÖÐÔö¼ÓÒ»¸ö varchar ÁУº
¡¡¡¡ALTER TABLE distributors ADD COLUMN address varchar(30);
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¡¡¡¡ALTER TABLE distributors DROP COLUMN address RESTRICT;
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¡¡¡¡ALTER TABLE distributors
¡¡¡¡ALTER COLUMN address TYPE varchar(80),
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