如何在 SQL Server 2012 中生成特定查询

Question

我需要生成一份报告，其中包含特定产品的销售数量。 （服装）

我有 4 张桌子：

• Orders 包含 ID 和日期
• Product_Model 包含模型描述和性别
• Product_Type 包含产品型号 ID、价格、尺寸、颜色
• Product_Order 包含“Orders”引用和“Product_Type”引用

我需要生成一份报告，例如显示所有月份男性蓝色 T 恤的数量。

按此顺序：产品型号/性别/颜色

例如：

Also check my simple representation in SQLFiddle

非常感谢您的支持！ =)

Answer 1

试试这样的：

SELECT MODEL, 
       GENDER, 
       COLOR, 
       SUM(CASE 
             WHEN MONTH(ORDER_DATE) = 1 THEN 1 
             ELSE 0 
           END) Jan, 
       SUM(CASE 
             WHEN MONTH(ORDER_DATE) = 2 THEN 1 
             ELSE 0 
           END) Feb, 
       SUM(CASE 
             WHEN MONTH(ORDER_DATE) = 3 THEN 1 
             ELSE 0 
           END) Mar, 
       SUM(CASE 
             WHEN MONTH(ORDER_DATE) = 4 THEN 1 
             ELSE 0 
           END) Apr 
FROM   PRODUCT_MODELS t1 
       INNER JOIN PRODUCT_TYPES t2 
               ON t1.PRODUCT_MODEL_ID = t2.PRODUCT_MODEL_ID 
       INNER JOIN PRODUCT_ORDERS T3 
               ON t2.PRODUCT_TYPE_ID = t3.PRODUCT_TYPE_ID 
       INNER JOIN ORDERS T4 
               ON T3.ORDER_ID = T4.ORDER_ID 
GROUP  BY MODEL, 
          GENDER, 
          COLOR 

我用你的 SQL 提琴做了my own example。

Answer 2

其他解决方案可以使用 SQL Pivot Table query 满足您的要求

这是我在您的表上构建的数据透视查询

with OrderReport as (
select
--  o.Order_ID,
--  date,
    DATENAME(Month,date) months,
    Order_Quantity,
--  Price,
--  Size,
--  Color,
--  model_description,
--  gender,
    product = model_description + ' / ' + gender + ' / ' + Color
from Orders o
inner join Product_Order po on po.Order_ID = o.Order_ID
inner join Product_Type t on t.Product_Type_ID = po.Product_Type_ID
inner join Product_Model m on m.Product_Model_ID = t.Product_Model_ID
) SELECT * FROM OrderReport
PIVOT (
    SUM(Order_Quantity)
    FOR months IN (
        [January],[February],[March],[April],
        [May],[June],[July],[August],
        [September],[October],[November],[December]
    )
) PivotTable

这里是 DDL 和一些用于测试数据透视查询的示例数据

create table Product_Model (Product_Model_ID int, model_description nvarchar(50),     gender nvarchar(20))
create table Product_Type (Product_Type_ID int, Product_Model_ID int, price int, size nvarchar(20), color nvarchar(20))
create table Orders (Order_ID int, date datetime)
create table Product_Order (Order_ID int, Product_Type_ID int, Order_Quantity int)

insert into Product_Model select 1, 'Basic T-Shirt','Male'
insert into Product_Model select 2, 'Basic T-Shirt','Female'
insert into Product_Model select 3, 'Polo','Male'
insert into Product_Model select 4, 'Polo','Female'
insert into Product_Model select 5, 'Jacket','Male'
insert into Product_Model select 6, 'Jacket','Female'
insert into Product_Model select 7, 'Long T-Shirt','Female'

insert into Product_Type select 1,1,1,'1','Red'
insert into Product_Type select 2,1,1,'1','Blue'
insert into Product_Type select 3,2,1,'1','Cyano'
insert into Product_Type select 4,2,1,'1','Pink'
insert into Product_Type select 5,3,2,'1','Grey'
insert into Product_Type select 6,3,2,'1','Black'
insert into Product_Type select 7,4,2,'1','Blue'
insert into Product_Type select 8,4,2,'1','Red'

insert into Orders select 1,'20130131'
insert into Orders select 2,'20130110'
insert into Orders select 3,'20130216'
insert into Orders select 4,'20130220'
insert into Orders select 5,'20130311'
insert into Orders select 6,'20130311'

insert into Product_Order select 1,1,3
insert into Product_Order select 2,1,5
insert into Product_Order select 3,2,7
insert into Product_Order select 4,1,4
insert into Product_Order select 5,1,1
insert into Product_Order select 6,3,8

希望对你有帮助，