truncate table tablename
DBCC CHECKIDENT(tablename,RESEED,1)

if exists(select name from sysobjects where name='tablename' and type='u')

if exists(select * from sys.columns,sys.tableswhere sys.columns.object_id = sys.tables.object_idand sys.tables.name='tablename' and sys.columns.[name]='columnname')

--取数据库中表的集合
select * from sysobjects where xtype='u' order by name--取表中字段的一些基本信息
selectsys.columns.name,  --字段名sys.types.name as typename, --字段类型sys.columns.max_length,    --字段长度sys.columns.is_nullable,    --是否可空(selectcount(*)fromsys.identity_columnswheresys.identity_columns.object_id = sys.columns.object_idandsys.columns.column_id = sys.identity_columns.column_id) as is_identity ,--是否自增(selectvaluefromsys.extended_propertieswheresys.extended_properties.major_id = sys.columns.object_idandsys.extended_properties.minor_id = sys.columns.column_id) as description  --注释
fromsys.columns, sys.tables, sys.types
wheresys.columns.object_id = sys.tables.object_id
andsys.columns.system_type_id=sys.types.system_type_id
andsys.tables.name='tablename'
order by sys.columns.column_id

create procedure procname
as
begin tran--执行sql语句if @@ERROR!=0
beginrollback tran   --失败
end
else
begincommit tran   --成功
end  

DUMP TRANSACTION DatabseName WITH NO_LOG
BACKUP LOG DatabseName WITH NO_LOG
DBCC  SHRINKFILE(DatabseLogName,1)
--DatabseName为数据库名称
--DatabseLogName为日志文件名，可以通过下面语句得到
--select name from sysfiles 

select db_name()
Test
(1 行受影响)

select object_id('objectname')
--判断表是否存在
if  object_id('tablename') is not null

sp_helptext 'objectname'

select parsename('oec2003.databasename.dbo.tablename',1)
--对象名称返回tablename
select parsename('oec2003.databasename.dbo.tablename',2)
--Schema名称返回dbo
select parsename('oec2003.databasename.dbo.tablename',3)
--数据库名称返回databasename
select parsename('oec2003.databasename.dbo.tablename',4)
--服务器名称返回oec2003