一道关于 SQLServer 交叉查询的 外企面试题

Can you create a cross-tab report in my SQL Server!
How can I get the report about sale quality for each store and each quarter and the total sale quality for each quarter at year 1993?
You can use the table sales and stores in datatabase pubs.
Table Sales record all sale detail item for each store. Column store_id is the id of each store, ord_date is the order date of each sale item, and column qty is the sale qulity. Table stores record all store information.
I want to get the result look like as below:
Output:

stor_name Total Qtr1 Qtr2 Qtr3 Qtr4
------------------------------------------------ ----------- ----------- ----------- ----------- -----------
Barnum's 50 0 50 0 0
Bookbeat55 25 30 0 0
Doc-U-Mat: Quality Laundry and Books 85 0 85 0 0
Fricative Bookshop60 35 0 0 25
Total 25060 165025

答案:

select
b.stor_name,
total=sum(a.qty),
Q1=sum(case when datepart(mm,ord_date)<4 then a.qty else 0 end),
Q2=sum(case when datepart(mm,ord_date)>3 and datepart(mm,ord_date)<7 then a.qty else 0 end),
Q3=sum(case when datepart(mm,ord_date)>6 and datepart(mm,ord_date)<10 then a.qty else 0 end),
Q4=sum(case when datepart(mm,ord_date)>9 then a.qty else 0 end)
from sales as a
inner join stores as b on b.stor_id = a.stor_id
where a.ord_date BETWEEN convert(datetime,'1992-12-31 23:59:59') and convert(datetime,'1994-1-1')
group by b.stor_name
union
select 'total',
sum(a.qty),
sum(case when datepart(mm,ord_date)<4 then a.qty else 0 end),
sum(case when datepart(mm,ord_date)>3 and datepart(mm,ord_date)<7 then a.qty else 0 end),
sum(case when datepart(mm,ord_date)>6 and datepart(mm,ord_date)<10 then a.qty else 0 end),
sum(case when datepart(mm,ord_date)>9 then a.qty else 0 end)
from sales as a
inner join stores as b on b.stor_id = a.stor_id
where a.ord_date BETWEEN convert(datetime,'1992-12-31 23:59:59') and convert(datetime,'1994-1-1')

没有pubs数据库的可以到这里找到创建pubs数据库的sql脚本.