标签:des style blog class code tar
存储过程
1 CREATE PROCEDURE spInsertOrUpdateProduct 2 --有则更新,否则插入 3 @ProductName NVARCHAR(50) , 4 @ProductNumber NVARCHAR(25) , 5 @StdCost MONEY 6 AS 7 IF EXISTS ( SELECT * 8 FROM Production.Product 9 WHERE ProductNumber = @ProductNumber ) 10 UPDATE Production.Product 11 SET Name = @ProductName , 12 StandardCost = @StdCost 13 WHERE ProductNumber = @ProductNumber 14 ELSE 15 INSERT INTO Production.Product 16 ( Name , 17 ProductNumber , 18 StandardCost 19 ) 20 SELECT @ProductName , 21 @ProductNumber , 22 @StdCost 23 24 GO
触发器
1 CREATE TRIGGER tr_DelProduct ON Production.Product 2 FOR DELETE 3 AS 4 IF ( SELECT COUNT(*) 5 FROM sales.SalesOrderDetail 6 INNER JOIN DELETED ON salesorderdetail.ProductID = DELETED.productid 7 ) > 0 8 BEGIN 9 RAISERROR (‘Cannot delete a product with sales orders‘,14,1) 10 ROLLBACK TRANSACTION 11 RETURN 12 END
自定义函数
1 CREATE FUNCTION dbo.fn_LastOfMonth ( @TheDate DATETIME ) 2 RETURNS DATETIME 3 AS 4 BEGIN 5 DECLARE @FirstOfMonth DATETIME 6 DECLARE @DaysInMonth INT 7 DECLARE @RetDate DATETIME 8 SET @FirstOfMonth = DATEADD(mm, DATEDIFF(mm, 0, @TheDate), 0) 9 SET @DaysInMonth = DATEDIFF(d, @FirstOfMonth, 10 DATEADD(m, 1, @FirstOfMonth)) 11 RETURN DATEADD(d,@DaysInMonth-1,@FirstOfMonth) 12 END
查看表的元数据,也就是数据的数据
1 SELECT * 2 FROM sys.columns 3 WHERE [object_id] = OBJECT_ID(‘Production.Product‘)
不建议用上面的系统试图
可以用数据库视图
1 IF NOT EXISTS ( SELECT * 2 FROM INFORMATION_SCHEMA.TABLES 3 WHERE TABLE_NAME = ‘Address‘ 4 AND TABLE_NAME = ‘Person‘ ) 5 DROP TABLE PERSON.Address 6 GO
修改对象
1 ALTER PROCEDURE spInsertOrUpdateProduct 2 @ProductName NVARCHAR(50) , 3 @ProductNumber NVARCHAR(25) , 4 @StdCost MONEY , 5 @ListPrice MONEY 6 AS 7 BEGIN TRY 8 BEGIN TRANSACTION 9 IF EXISTS ( SELECT * 10 FROM Production.Product 11 WHERE ProductNumber = @ProductName ) 12 UPDATE Production.Product 13 SET Name = @ProductName , 14 StandardCost = @StdCost 15 WHERE ProductNumber = @ProductNumber 16 ELSE 17 INSERT INTO production.Product 18 ( Name , 19 ProductNumber , 20 StandardCost , 21 ListPrice 22 ) 23 SELECT @ProductName , 24 @ProductNumber , 25 @StdCost , 26 @ListPrice 27 COMMIT TRANSACTION 28 END TRY 29 BEGIN CATCH 30 DECLARE @ErrMsg VARCHAR(1000) 31 SET @ErrMsg = ERROR_MESSAGE() 32 ROLLBACK TRANSACTION 33 RAISERROR(@ErrMsg,14,1) 34 RETURN 35 END CATCH
添加和删除表列
1 ALTER TABLE Production.Product 2 ADD LeadTime SMALLINT NULL 3 4 ALTER TABLE production.Product 5 DROP COLUMN LeadTime
WITH TIES用法,找出最贵的一个商品,但最贵的有好多个
1 SELECT TOP(1) WITH TIES * FROM Production.Product 2 ORDER BY ListPrice DESC 3 --返回5条记录
标签:des style blog class code tar
原文地址:http://www.cnblogs.com/wanghaibin/p/3714824.html