在sql中使用查询的if语句
我想问一下如何使用在sql中使用查询的if语句,sql,sql-server,stored-procedures,if-statement,sql-server-2000,Sql,Sql Server,Stored Procedures,If Statement,Sql Server 2000,我想问一下如何使用SQL中的IF语句执行条件检查,类似下面的示例 if (select* from table where id = @id) = 1 --if this returns a value insert statement else update statement go 或者类似的东西,比如使用存储过程 if (exec SP_something 2012, 1) = 0 insert statement else update stement 或者在sql
SQL
中的IF语句执行条件检查,类似下面的示例
if (select* from table where id = @id) = 1 --if this returns a value
insert statement
else
update statement
go
或者类似的东西,比如使用存储过程
if (exec SP_something 2012, 1) = 0
insert statement
else
update stement
或者在sql语句中使用UDF,如
if (select dbo.udfSomething(1,1,2012)) = 0
insert statement
else
update statement
go
您将需要执行以下操作:
IF (SELECT COUNT(*) FROM Table WHERE ID = @id) = 1
BEGIN
UPDATE Table SET Name = 'Name' WHERE ID = @id
END
ELSE
BEGIN
INSERT INTO Table (Name) VALUES ('Name');
END
(1)使用语句块
IF
(SELECT COUNT(*) FROM Production.Product WHERE Name LIKE 'Touring-3000%' ) > 5
BEGIN
PRINT 'There are 5 Touring-3000 bikes.'
END
ELSE
BEGIN
PRINT 'There are Less than 5 Touring-3000 bikes.'
END ;
(2)调用存储过程。
DECLARE @compareprice money, @cost money
EXECUTE Production.uspGetList '%Bikes%', 700,
@compareprice OUT,
@cost OUTPUT
IF @cost <= @compareprice
BEGIN
PRINT 'These products can be purchased for less than
$'+RTRIM(CAST(@compareprice AS varchar(20)))+'.'
END
ELSE
PRINT 'The prices for all products in this category exceed
$'+ RTRIM(CAST(@compareprice AS varchar(20)))+'.'
声明@compareprice money,@cost money
执行Production.uspGetList“%Bikes%”,700,
@比较一下价格,
@成本产出
IF@cost以下示例将帮助您使用IF-ELSE
CREATE PROCEDURE SetEngineerStock
@EngineerId INT,
@PartNumber CHAR(8),
@NewUnitsHeld DECIMAL(6,2)
AS
BEGIN
SET NOCOUNT ON;
-- Does stock entry exist?
IF EXISTS(SELECT * FROM EngineerStock
WHERE EngineerId = @EngineerId AND PartNumber = @PartNumber)
-- Yes, update existing row
UPDATE EngineerStock
SET UnitsHeld = @NewUnitsHeld
WHERE EngineerId = @EngineerId AND PartNumber = @PartNumber
ELSE
-- No, insert new row
INSERT INTO EngineerStock
VALUES(@EngineerId, @PartNumber, @NewUnitsHeld)
END
@MuhammadHani先生,存储过程应该返回一个值,对吗?嗯,它被宣布为输出?输出和输出正确的2个参数sir?