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alter table docdsp  add dspcode char(200)
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ALTER TABLE
table_NAME DROP COLUMN column_NAME
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ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type
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sp_rename
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sp_rename [ @objname = ] 'object_name' ,
    [ @newname = ]
'new_name'
    [ , [ @objtype = ] 'object_type' ]
--¼ÙÉèÒª´¦ÀíµÄ±íÃûΪ: tb
--ÅжÏÒªÌí¼ÓÁеıíÖÐÊÇ·ñÓÐÖ÷¼ü
if exists(select 1 from sysobjects where
parent_obj=object_id('tb') and xtype='PK')
begin
 print
'±íÖÐÒѾ­ÓÐÖ÷¼ü,ÁÐÖ»ÄÜ×öΪÆÕͨÁÐÌí¼Ó'
 --Ìí¼ÓintÀàÐ͵ÄÁÐ,ĬÈÏֵΪ0
 alter table tb add ÁÐÃû int default 0 
end
else
begin
 print
'±íÖÐÎÞÖ÷¼ü,Ìí¼ÓÖ÷¼üÁÐ'
 --Ìí¼ÓintÀàÐ͵ÄÁÐ,ĬÈÏֵΪ0
 alter table tb add ÁÐÃû int primary key default

end
/**************************************************************************************/
ÅÐ
¶Ïtable1ÖÐÊÇ·ñ´æÔÚname×Ö¶Î
if exists(select * from syscolumns where
id=object_id('table1') and name='name') begin
select * from people;
end


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IF NOT EXISTS (SELECT * from ::fn_listextendedproperty
(N'MS_Description' , N'SCHEMA',N'dbo',
N'TABLE',N'±íÃû', N'COLUMN',N'ÁÐÃû'))
EXEC sys.sp_addextendedproperty @name=N'MS_Description',
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--exec sp_decrypt 'DF_InsuranceRecord_PeriodUnit'
--exec sp_decrypt '´æ´¢¹ý³ÌÃû³Æ'
--exec sp_decrypt 'sp_SearchPrinting_InsuranceRecord'
--Ö÷ÒªÓÃ;:¶ÁÈ¡systemcommentsÖеÄ×Ö¶ÎÄÚÈÝ¡£°üÀ¨Ô¼Êø,´æ´¢¹ý³ÌµÈµÈ¡£
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ÔÚSQL serverÖо­³£»áת»»stringµ½datetimeÀàÐÍ£¬×î³£Óõĺ¯Êý¾ÍÊÇConvert¡£ÄÇô¶ÔConvertÕâ¸öº¯Êý£¬²»µÃ²»ÏêϸµÄÑо¿Ò»Ï¡£ConvertÕâ¸öº¯ÊýµÄ¹¦ÄܺÜÇ¿´ó£¬¸ñʽÓֺܼòµ¥CONVERT ( data_type [ ( length ) ] , expression [ , style ] )¡£µ¥¾Í½«stringµ½datetimeÀàÐ͵Äת»»¾ÍÓкܶàÑùʽ¡£Èç: Convert(datetime, expression), ......
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