根据计算列计算列并包含IF语句

Question

我遇到了一个我想写的查询问题。 该查询应该向我提供客户编号，该客户的总收入以及收入的其他值（即＆＃39; Gold＆＃39;，＆＃39; Silver＆＃39;或＆＃39; Bronze＆＃ 39）。 我有一个查询，为我提供每个客户的总收入：

CREATE PROCEDURE sp_klantOverzicht 
DECLARE @beginDatum DATETIME
DECLARE @eindDatum DATETIME
--AS
SET @beginDatum = '2013-01-01 00:00:00.000';
SET @eindDatum = '2017-01-01 00:00:00.000';
SELECT KLANT_NR, SUM(PRIJS) AS OMZET
FROM (
    SELECT kl.KLANT_NR, SUM(DATEDIFF(d, h.STARTDATUM, h.EINDDATUM)*a.PRIJS_PER_D) AS PRIJS
    FROM HUUROVEREENKOMST AS h
    LEFT JOIN ARTIKEL AS a
    ON h.BARCODE = a.BARCODE
    LEFT JOIN KLANT AS kl 
    ON kl.KLANT_NR = h.KLANT_NR
    WHERE DATEPART(year, h.STARTDATUM) BETWEEN DATEPART(year, @beginDatum) 
    AND DATEPART(year, @eindDatum)
    GROUP BY kl.KLANT_NR
    UNION
    SELECT kl.KLANT_NR, SUM(a.PRIJS) AS PRIJS
    FROM ARTIKEL AS a
    LEFT JOIN KOOPOVEREENKOMST AS k
    ON k.BARCODE = a.BARCODE
    LEFT JOIN KLANT AS kl 
    ON kl.KLANT_NR = k.KLANT_NR
    WHERE DATEPART(year, k.DATUM) BETWEEN DATEPART(year, @beginDatum) 
    AND DATEPART(year, @eindDatum)
    GROUP BY kl.KLANT_NR
) AS overzicht
GROUP BY KLANT_NR
ORDER BY OMZET DESC

它会给我一个这样的结果：

现在，我需要的是检查＆＃39; OMZET＆＃39;列高于50,100或150，然后添加＆＃39; Bronze＆＃39;，＆＃39; Silver＆＃39;或者＆＃39; Gold＆＃39;在第三栏。

我试图在SELECT语句中使用子查询来实现此目的，并创建一个计算第三列的函数。但没有结果。 任何人都可以帮我找到正确的解决方案吗？

所有帮助将不胜感激！

Answer 1

使用CASE ... WHEN语句

SELECT KLANT_NR, SUM(PRIJS) AS OMZET,
    CASE WHEN SUM(PRIJS) >= 150 THEN 'GOLD'
         WHEN SUM(PRIJS) >= 100 THEN 'SILVER'
         WHEN SUM(PRIJS) >=  50 THEN 'BRONZE'
         END
FROM ( ....

将其作为选择元素

之一添加到您的查询中