[英]SQL Server : Must declare the scalar variable
我需要將全局變量聲明為計數器
DECLARE @counter int
SET @counter = 0;
然后使用存儲過程,但它總是告訴我@counter
必須聲明為標量變量
CREATE OR ALTER PROCEDURE proc_counter_type
@type NVARCHAR(15),
@dateFirst DATE,
@dateSecond DATE
AS
SELECT @counter = COUNT(title_id)
FROM books
WHERE type = @type AND (datum BETWEEN @dateFirst AND @dateSecond)
您需要添加@Counter
作為OUTPUT
參數:
CREATE OR ALTER PROCEDURE proc_counter_type @type nvarchar(15), @dateFirst date, @dateSecond date, @Counter int OUTPUT
AS
BEGIN
SELECT @counter = COUNT(title_id)
FROM books
WHERE type = @type
AND (datum BETWEEN @dateFirst AND @dateSecond);
END;
然后執行 SP 為:
DECLARE @counter int;
--Other Params
EXEC proc_counter_type, @Type, @dateFirst, @dateSecond, @Counter OUTPUT;
PRINT @Counter;
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