Question

我在以下代码中收到了WHERE子句的语法错误。问题是什么？

CREATE PROC spIncreaseHours
(@ID int, @HoursPerWeek DEC, @HourlyRate INT)
AS
INSERT INTO Payments
Values (@HoursPerWeek, @HourlyRate)
WHERE ID = @ID;

Answer 1

您可能想要更新：

CREATE PROC spIncreaseHours
(@ID int, @HoursPerWeek DEC, @HourlyRate INT)
AS
UPDATE Payments set 
HoursPerWeek = @HoursPerWeek, 
HourlyRate = @HourlyRate
WHERE ID = @ID;

Answer 2

您无法将WHERE与INSERT一起使用。您要么想要插入新行，要么更新现有行。例如INSERT：

CREATE PROC spIncreaseHours
(@ID int, @HoursPerWeek DEC, @HourlyRate INT)
AS
INSERT INTO Payments
Values (@ID, @HoursPerWeek, @HourlyRate);

或UPDATE：

CREATE PROC spIncreaseHours
(@ID int, @HoursPerWeek DEC, @HourlyRate INT)
AS
UPDATE Payments
SET HoursPerWeek = @HoursPerWeek, 
     HourlyRate = @HourlyRate
WHERE ID = @ID;

当然，还有第三种可能性，您不知道@ID的行是否已存在，因此您可以先进行检查：

CREATE PROC spIncreaseHours
(@ID int, @HoursPerWeek DEC, @HourlyRate INT)
AS
IF EXISTS (SELECT ID FROM Payments WHERE ID = @ID)
    UPDATE Payments
    SET HoursPerWeek = @HoursPerWeek, 
        HourlyRate = @HourlyRate
    WHERE ID = @ID;
ELSE
    INSERT INTO Payments
    Values (@ID, @HoursPerWeek, @HourlyRate);

将WHERE与存储过程一起使用

2 个答案: