Question

我有一个程序可以根据日期获取一些数据。

ALTER PROCEDURE [dbo].[GetLatestTicketsByDate]
    @Datemin datetime2,
AS
BEGIN
    DECLARE @LatestTickets TABLE
    (
        DomainId bigint, 
        SoldTickets bigint
    )

    INSERT INTO @LatestTickets(DomainId,SoldTickets)
        SELECT  
            DomainId, SoldTickets 
        FROM 
            DomainDetailDataHistory
        WHERE  
            [Date] >= @Datemin

    SELECT * FROM @LatestTickets
END

现在我想通过向它添加一个新的参数来使这个过程变得更聪明但是这个参数是可选的。

我的代码如下所示：

    ALTER PROCEDURE [dbo].[GetLatestTicketsByDate]
        @Datemin datetime2,
        @Id uniqueidentifier = NULL 
    AS
    BEGIN
        DECLARE @LatestTickets TABLE
        (
            DomainId bigint, 
            SoldTickets bigint
        )

        IF (@Id IS NULL)
        BEGIN 
            INSERT INTO @LatestTickets(DomainId,SoldTickets)
                SELECT DomainId, SoldTickets 
                FROM DomainDetailDataHistory
                WHERE [Date] >= @Datemin

            SELECT * FROM @LatestTickets
        END
        ELSE
        BEGIN 
            INSERT INTO @LatestTickets(DomainId,SoldTickets)
                SELECT DomainId, SoldTickets 
                FROM DomainDetailDataHistory
                WHERE Id = @Id AND  [Date] >= @Datemin

            SELECT * FROM @LatestTickets
     END
END

这有效，但我不喜欢这种结构，并想知道是否有更好的方法？

我试过了：

INSERT INTO @LatestTickets(DomainId,SoldTickets)
    SELECT DomainId, SoldTickets 
    FROM DomainDetailDataHistory
    WHERE (@Id IS NOT NULL AND Id = @Id) AND [Date] >= @Datemin

SELECT * FROM @LatestTickets

但它没有用。

Answer 1

使用@Id IS NULL OR Id = @Id

INSERT INTO @LatestTickets(DomainId,SoldTickets)
SELECT  DomainId, SoldTickets
FROM DomainDetailDataHistory
WHERE (@Id IS NULL OR Id = @Id) AND  [Date] >= @Datemin

如何优化SQL中的空检查？

1 个答案: