MySQL组合特定字段

这与相关，但在格式和执行方面有所不同（显然）。我试着使用那里的信息，但没有任何逻辑结果

案例：该公司有多个部门。我们想知道我们在哪里赚钱

我们的桌子看起来像这样-

  Date  | Total | Item Description
-----------------------------------
12122012  1000      Butter cookies
12122012   600      Chocolate Coins
12122012  1500      Candy Canes
12142012  1300      Apple Pie
12142012  1300      Pumpkin Pie
12142012   900      Chocolate Cookies

我想保留的格式完全一样，但分组的糖果，饼干和馅饼的产品。我们的代码如下所示：

SELECT Payments_ReceivedDate AS date, CAST(sum(Payments_Amount) AS UNSIGNED ) as total, 
       tblTreats.Item_Description as 'Item Description'
       FROM tblPayments 
       INNER JOIN tblTreats ON tblPayments.Items_Ordered = tblTreats.Treats_PK 
       WHERE Payments_ReceivedDate BETWEEN '20120101' AND '20140101' 
       GROUP BY Items_Ordered

---

任何帮助都将不胜感激。

重要的是，这使用了与其他示例不同的表。它限制了“颜色”和“计数”的使用；将其替换为“项目描述”和“总计”。问题是，通过使用这些信息进行操作，它会将表更改为缺少大量信息的输出。它最终使

糖果计数

，

饼干计数

，和

馅饼计数

成为一个字段的总数；我错了，我要用正确的栏编辑答案。

-- use a subquery
select sum(case when Item_Description in ('Candy Canes') then total end) as Candies_total,
       sum(case when Item_Description in ('Butter cookies', 'Butter cookies','Chocolate Cookies') then total end) as Cookies_total,
       sum(case when Item_Description in ('Apple Pie','Pumpkin Pie') then total end) as Pies_total
from (SELECT Payments_ReceivedDate AS date, CAST(sum(Payments_Amount) AS UNSIGNED ) as total, 
       tblTreats.Item_Description as Item_Description
       FROM tblPayments 
       INNER JOIN tblTreats ON tblPayments.Items_Ordered = tblTreats.Treats_PK 
       WHERE Payments_ReceivedDate BETWEEN '20120101' AND '20140101' 
       GROUP BY Items_Ordered) AS t