SQLÎļÓÃÜ
use Tempdb
go
if object_ID('fn_ACITEncryption') is not null
drop function fn_ACITEncryption
go
create function fn_ACITEncryption
(
@Str nvarchar(4000),--¼ÓÃܵÄ×Ö·û´®
@Flag bit=1,--1¡¢¼ÓÃÜ 0¡¢½âÃÜ
@Key nvarchar(50)--ÃÜÎÄ
)
returns nvarchar(4000)--這Àï¿É轉換³É¶þ進ÖÆ
with Encryption
as
begin
Declare @LenStr int,@i int,@Str2 nvarchar(4000),@Split nvarchar(2),@LenKey int
select @Str=@Str+'A',@LenStr=len(@Str),@i=1,@Str2='',@LenKey=Len(@Key+'A')-1
while @i<@LenStr
select @Split=substring(@Str,@i,1),
@Split=nchar((unicode(@Split)+case @Flag when 1 then unicode(substring(@Key+'A',@i%@LenKey+1,1))-1
when 0 then 65535-unicode(substring(@Key+'A',@i%@LenKey+1,1))
else 0 end)%65535+cast(@Flag as int)),
@Str2=@Str2+@Split,@i=@i+1
return @Str2
end
go
select dbo.fn_ACITEncryption(N'Roy',1,'123') as ¼ÓÃܺó×Ö·û´®
/*
¼ÓÃܺó×Ö·û´®
------------------------------
¢ª
(1 個資ÁÏÁÐÊܵ½Ó°響)
*/
select dbo.fn_ACITEncryption(N'¢ª',0,'123') as ½âÃܺó×Ö·û´®
/*
½âÃܺó×Ö·û´®
--------------------------
Roy
(1 個資ÁÏÁÐÊܵ½Ó°響)
*/
Ïà¹ØÎĵµ£º
TA:
1,WANG
2,ZHANG
4,LI
TB:
1,100
2,200
3,400
1.left join ×óÁ¬½Ó--ÒÔ×ó±íΪ»ù×¼£¬ÓÒ±íÖÐûֵµÄ£¬ÔÚ½á¹û¼¯ÖÐÒÔnullÖµ´úÌæ¡£(select * from TA left join TB where TA.ID=TB.ID)
1,WANG,100
2,ZHANG,200
4,NULL
2.right join ÓÒÁ¬½Ó--ÒÔÓÒ±íΪ»ù×¼£¬×ó±íÖÐûֵµÄ£¬ÔÚ ......
--´¦ÀíʾÀý
--ʾÀýÊý¾Ý
create table tb(ID int,Name varchar(10),ParentID int)
insert tb select 1,'AAAA' ,0
union all select 2,'BBBB' ,0
union all select 3,'CCCC' ,0
union all select 4,'AAAA-1' ,1
union all select 5,'AAAA-2' ,1
u ......
--¿ç·þÎñÆ÷²éѯÈçÏ£º
SELECT a.*,b.stor_Name
from OPENROWSET('MSDASQL',
'DRIVER={SQL Server};SERVER=tom;UID=sa;PWD=123',
pubs.dbo.authors) AS a,stores b
ORDER BY a.au_lname, a.au_fname
--ÆäÖУ¬tomΪԶ³Ì·þÎñÆ÷Ãû£¬stores ÊDZ¾»úÊý¾Ý¿âpubsÖеıí
--ÐèҪעÒâµÄÊÇÈô¶þ¸ö±íÖÐµÄ ......
Sql ServerÖеÄÈÕÆÚÓëʱ¼äº¯Êý
1. µ±Ç°ÏµÍ³ÈÕÆÚ¡¢Ê±¼ä
select getdate()
2. dateadd ÔÚÏòÖ¸¶¨ÈÕÆÚ¼ÓÉÏÒ»¶Îʱ¼äµÄ»ù´¡ÉÏ£¬·µ»ØÐ嵀 datetime Öµ
ÀýÈ磺ÏòÈÕÆÚ¼ÓÉÏ2Ìì
select dateadd(day,2,'2004-10-15') --·µ»Ø£º2004-10-17 00:00:00.000
3. datediff ·µ»Ø¿çÁ½¸öÖ ......
left join(×óÁª½Ó) ·µ»Ø°üÀ¨×ó±íÖеÄËùÓмǼºÍÓÒ±íÖÐÁª½á×Ö¶ÎÏàµÈµÄ¼Ç¼
right join(ÓÒÁª½Ó) ·µ»Ø°üÀ¨ÓÒ±íÖеÄËùÓмǼºÍ×ó±íÖÐÁª½á×Ö¶ÎÏàµÈµÄ¼Ç¼
inner join(µÈÖµÁ¬½Ó) Ö»·µ»ØÁ½¸ö±íÖÐÁª½á×Ö¶ÎÏàµÈµÄÐÐ
¾ÙÀýÈçÏ£º
--------------------------------------------
±íA¼Ç¼ÈçÏ£º
aID¡¡¡¡¡¡¡¡¡¡aNum
1¡¡¡¡¡¡¡¡¡¡a ......