mysql - 在 GROUP BY() 之后过滤数据，反之亦然？

Question

下面是MySQL中的表

Table:ShopInfo

ShopCode     ShopName
--------     -------
X            Xylophon
Y            Yellow
Z            Zoota
K            Kite

Table: Income

Shop     Date           Earnings
-----    ----------     --------
X        2014-10-17     4000
Y        NULL           NULL
Y        2014-11-09     5000
Y        2014-11-18     3000
Y        2014-12-05     2000
Z        2014-12-25     6000
K        NULL           NULL

我想仅在 11 月份查找每家商店的总收入，Null 收入将被替换为零。结果表将是

ShopName    NovEarn
--------    -------
Yellow      8000
Kite        0 

这就是我正在做的:

SELECT ShopInfo.ShopName, IFNULL( SUM(Income.Earnings), 0 ) AS NovEarn
FROM Income
JOIN ShopInfo ON Income.Shop=ShopName.ShopCode
GROUP BY Income.Shop
HAVING (MONTH(Income.Date)=11 AND YEAR(Income.Date)=2014) OR Date IS NULL
ORDER BY NovEarn DESC

它给了我

ShopName    NovEarn
--------    -------
Yellow      10000
Kite        0

即所有月份的收入总和。我做错了什么？

Answer 1

尝试放置 having 子句和 where 子句:

SELECT ShopInfo.ShopName, IFNULL( SUM(Income.Earnings), 0 ) AS NovEarn
FROM Income
JOIN ShopInfo ON Income.Shop=ShopName.ShopCode
WHERE (MONTH(Income.Date)=11 AND YEAR(Income.Date)=2014) OR Date IS NULL
GROUP BY Income.Shop
ORDER BY NovEarn DESC