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eg £º2008-3-31 10:34 --> 2008-3-31
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select substring('2008-3-31 10:34',0,charindex(' ','2008-3-31 10:34'))
¶þ.
Select
CONVERT(varchar, getdate(), 1),--mm/dd/yy
CONVERT(varchar, getdate(), 2),--yy.mm.dd
CONVERT(varchar, getdate(), 3),--dd/mm/yy
CONVERT(varchar, getdate(), 4),--dd.mm.yy
CONVERT(varchar, getdate(), 5),--dd-mm-yy
CONVERT(varchar, getdate(), 10),--mm-dd-yy
CONVERT(varchar, getdate(), 11),--yy/mm/dd
CONVERT(varchar, getdate(), 12)--yymmdd
----´øÊÀ¼ÍºÅ
select convert(varchar(10),getdate(),100) --06 15 2007 »ò0
select convert(varchar(10),getdate(),102) --2007.06.15
select convert(varchar(10),getdate(),103) --15/06/2007
select convert(varchar(10),getdate(),104) --15.06.2007s
select convert(varchar(10),getdate(),105) --15-06-2007
select convert(varchar(10),getdate(),106) --15 06 2007
select convert(varchar(10),getdate(),107) --06-15,200
select convert(varchar(10),getdate(),108) --10:06:46 µ±Ç°Ê±¼ä
select convert(varchar(10),getdate(),109) --06 15 2007 »òÕß9
select convert(varchar(10),getdate(),110) --06-15-2007
select convert(varchar(10),getdate(),111) --2007/06/15
select convert(varchar(10),getdate(),112) --20070615
select convert(varchar(10),getdate(),113) --15 06 2007 »òÕß13
select convert(varchar(10),getdate(),114) --10:10:37:0
select convert(varchar(10),getdate(),120) --2007-06-15 »ò20---------------<OK>
select convert(varchar(30),getdate(),121) --2007-06-15 10:11:45.040 »ò21
select convert(varchar(30),getdate(),126) --2007-06-15T10:12:44:603
select convert(varchar(50),getdate(),127) --2007-06-15T10:14:35:433 ˵´øÊ±Çø
select convert(varchar(40),getdate(),130) --ȯ˜dd mon yyyy hh:mi:ss:mmmAM
select convert(varchar(30),getdate(),131) --30/05/1428 10:17:19:470AM
GO

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create view RandomView as select re=rand()
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create function RandData(
@a int,
@b int)
returns decimal(38,0)
as
begin
declare @r decimal(38,0)
select @r=cast(re*(@b-@a)+@a as decimal(38,0)) from RandomView
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sqlserverºÍoracle³£Óú¯Êý¶Ô±È

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mysqlºÍsqlserverÖв鿴µ±Ç°¿âÖÐËùÓбíºÍ×Ö¶ÎÐÅÏ¢

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show tables [from db_name];
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SHOW FULL COLUMNS from db_name.table_name
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Field £º×Ö¶ÎÃû
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Collation£º×Ö·û¼¯ £¨mysql 5.0ÒÔÉÏÓУ©
Null £ºÊÇ·ñ¿ÉÒÔΪNULL
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Default£ºÈ±Ê¡Öµ
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