Question

我正在努力做出这样的声明：如果汽车年份比2012年更新，它将打印出来。然后，如果它比2012年更早，它将打印出来。唯一的问题是它给了我无效的对象名称.Attached是我的汽车表和我试过的代码。

CREATE TABLE CAR
(
    CarID       CHAR(8)     PRIMARY KEY, -- Primary key
    StoreID     CHAR(4),
    CarMake     VARCHAR(30),
    CarModel    VARCHAR(30),
    CarYear     CHAR(4),
    NeworUsed   VARCHAR(6),
    CarPrice    DECIMAL (6,2),
);


ALTER PROC CarYear
    @CarYear CHAR(4)
AS
BEGIN
    IF( 
        SELECT CarYear
        FROM CAR
        WHERE CarYear = @CarYear   
    ) >= 2012
    BEGIN 
        PRINT 'This car is newer than 2012!'
    END
    ELSE 
        PRINT 'Car is older than 2012'
END

Answer 1

CREATE TABLE CAR
(
CarID CHAR (8) PRIMARY KEY, -- Primary key
StoreID CHAR(4),
CarMake VARCHAR(30),
CarModel VARCHAR(30),
CarYear CHAR(4), -- better if you change to int type
NeworUsed VARCHAR(6),
CarPrice DECIMAL (6,2),
);

go
--change alter to create 
create proc CarYear

@CarYear char (4)

AS

BEGIN
-- add TOP 1, otherwise if you will have more than 1 record you'll get error
if( select TOP 1 CONVERT(INT,CarYear)

from CAR

where CONVERT(int,CarYear)= CONVERT(int,@CarYear)
-- CarYear is char type and you compare to int type
) >= 2012

begin 

print 'This car is newer than 2012!'
end

else 

print 'Car is older than 2012'

ENDCO

无效的对象名称＆＃39; CarYear＆＃39;

1 个答案: