mssql的object_id

--检查当前数据库的对象类型
select distinct type,type_desc from sys.objects order by type
type	type_desc
D 	DEFAULT_CONSTRAINT
F 	FOREIGN_KEY_CONSTRAINT
FN	SQL_SCALAR_FUNCTION
IT	INTERNAL_TABLE
P 	SQL_STORED_PROCEDURE
PK	PRIMARY_KEY_CONSTRAINT
S 	SYSTEM_TABLE
SQ	SERVICE_QUEUE
TF	SQL_TABLE_VALUED_FUNCTION
TR	SQL_TRIGGER
U 	USER_TABLE
V 	VIEW

-- 如果删除某个表对象可以使用
if (object_id('ta','U')) is not null
drop table ta