Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

SQLÎÞÏÞ·ÖÀà´æ´¢¹ý³ÌÕûÀí2

Ä£·Â²Î¿¼:¶¯Ò×ÎÞÏÞ·ÖÀà
Óŵã:ËãµÃÉÏÊÇÕæÕýµÄÎÞÏÞ·ÖÀ࣬²»¹ýParentPathÊÇÓоÖÏÞÐÔ,ClassIDÊDZêʶÁÐ×Ô¶¯ÔöÒ».
ȱµã:ÐÂÔö¹ý³ÌÖÐParentID²»´æÔÚ»¹Ã»ÓÐÍêÉÆ£¬»á²åÈëNULLÊý¾Ý.ºóÃæÈý¸ö´æ´¢¹ý³Ì»¹ÔÚ²âÊÔ¡£
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[ArticleClass]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[ArticleClass]
GO
CREATE TABLE [dbo].[ArticleClass] (
 [ClassID] [int] IDENTITY (1, 1) NOT NULL ,
 [ClassName] [nvarchar] (100) COLLATE Chinese_Taiwan_Stroke_CI_AS NULL ,
 [ParentID] [int] NULL ,
 [ParentPath] [nvarchar] (255) COLLATE Chinese_Taiwan_Stroke_CI_AS NULL ,
 [Depth] [int] NULL ,
 [RootID] [int] NULL ,
 [Child] [int] NULL ,
 [PrevID] [int] NULL ,
 [NextID] [int] NULL ,
 [OrderID] [int] NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[ArticleClass] ADD
 CONSTRAINT [DF_ArticleClass_ParentID_65E11278] DEFAULT (0) FOR [ParentID],
 CONSTRAINT [DF_ArticleClass_Depth_66D536B1] DEFAULT (0) FOR [Depth],
 CONSTRAINT [DF_ArticleClass_RootID_67C95AEA] DEFAULT (0) FOR [RootID],
 CONSTRAINT [DF_ArticleClass_Child_68BD7F23] DEFAULT (0) FOR [Child],
 CONSTRAINT [DF_ArticleClass_PrevID_69B1A35C] DEFAULT (0) FOR [PrevID],
 CONSTRAINT [DF_ArticleClass_NextID_6AA5C795] DEFAULT (0) FOR [NextID],
 CONSTRAINT [DF_ArticleClass_OrderID_6B99EBCE] DEFAULT (0) FOR [OrderID],
 CONSTRAINT [PK_ArticleClass] PRIMARY KEY  CLUSTERED
 (
  [ClassID]
 )  ON [PRIMARY]
GO
exec sp_addextendedproperty N'MS_Description', N'Ö÷¼ü', N'user', N'dbo', N'table', N'ArticleClass', N'column', N'ClassID'
GO
exec sp_addextendedproperty N'MS_Description', N'Àà±ðÃû³Æ', N'user', N'dbo', N'table', N'ArticleClass', N'column', N'ClassName'
GO
exec sp_addextendedproperty N'MS_Description', N'¸¸ÀàID', N'user', N'dbo', N'table', N'ArticleClass', N'column', N'ParentID'
GO
exec sp_addextendedproperty N'MS_Description', N'¸¸Àà·¾¶', N'user',


Ïà¹ØÎĵµ£º

Sqlº¯Êý´óÈ«

---·µ»Ø±í´ïʽÖÐÖ¸¶¨×Ö·ûµÄ¿ªÊ¼Î»ÖÃ
select charindex('c','abcdefg',1)
---Á½¸ö×Ö·ûµÄÖµÖ®²î
select difference('bet','bit')
---×Ö·û×î×ó²àÖ¸¶¨ÊýÄ¿
select left('abcdef',3)
---·µ»Ø×Ö·ûÊý
select len('abcdefg')
--ת»»ÎªÐ¡×Ö·û
select lower('ABCDEFG')
--È¥×ó¿Õ¸ñºó
select ltrim('   &nbs ......

SQL Serverº¯Êý´óÈ«

--¾ÛºÏº¯Êý
use pubs
go
select avg(distinct price)  --ËãÆ½¾ùÊý
from titles
where type='business'
go 
use pubs
go
select max(ytd_sales)  --×î´óÊý
from titles
go 
use pubs
go
select min(ytd_sales) --×îÐ¡Ê ......

[¼Ç¼]ÔÚÃüÁîÐÐÖÐÆô¶¯ SQL SERVER

Æô¶¯ MS SQL SERVER £¨2000 £­2008¶¼ÊÊÓã©£º
cmd>net start mssqlserver
Æô¶¯ ·ÇȱʡʵÀý£º
cmd>net start mssql$[instance name]
×¢£ºÃüÁîÐÐÐèÒªÓÐAdministratorȨÏÞ¡£
Í£Ö¹SQLSERVER ·þÎñÆ÷:
cmd>net stop mssqlserver
cmd>net stop mssql$[instance name] ......

sql³õ¼¶Óï·¨ ±Ê¼Ç×ܽá

num_field   number(12,2); 
±íʾnum_fieldÊÇÒ»¸öÕûÊý²¿·Ö×î¶à10λ¡¢Ð¡Êý²¿·Ö×î¶à2λµÄ±äÁ¿¡£ 
case.....when Ó÷¨£¨Óëdecode£¨£©×÷ÓúÜÏñ£©
select case zsxm_dm
         when '02' then
          'Ó ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ