常用sql

1.添加默认约束

---1.设置默认值约束CRM_Personas_DataSourceAmount

if exists(select * from sysobjects where name='DF_TestTable_FIM_Amount')
alter table TestDB.[dbo].TestTable drop constraint DF_TestTable_FIM_Amount;
go
--给指定列添加默认约束
alter table TestDB.[dbo].TestTable add constraint DF_TestTable_FIM_Amount default(0) for FIM_Amount;
go

2.执行带参数的存储过程pro_test

EXEC Pro_test 2021,1;

3.判断存储过程pro_test是否存在，存在则删除

if Exists(select name from sysobjects where NAME = 'Pro_test' and type='P')
drop procedure Pro_test

4.判断触发器是否存在，存在则删除

if exists(select * from dbo.sysobjects where id = object_id(N'[dbo].[T_Test]') and OBJECTPROPERTY(id, N'IsTrigger') = 1)
drop trigger T_Test

5.判断试图是否存在，存在则删除

IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME = N'v_test')
DROP View v_test

7.判断函数是否存在，存在则删除

(注意此处的type 有两种,分别是'TF'-Table-valued Function 表值函数 或'FN'-Scalar-valued Function 标量值函数)
if exists(select * from dbo.sysobjects where id = object_id(N'[dbo].[test_Fun]') and (type = 'FN' or type = 'TF'))
DROP FUNCTION test_Fun

8.判断表t_table是否存在，存在删除

if (exists (SELECT * FROM dbo.sysobjects where id = object_id(N't_test')and OBJECTPROPERTY(id, N'IsUserTable') = 1))
DROP TABLE t_test

9.判断库testdb是否存在

if exists( select * from master.dbo.sysdatabases where dbid=db_ID( 'testdb' ) )

drop database testdb

else

print 'no exist testdb'