某外企SQL Server面试题

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Question 1：Can you use a batch SQL or store procedure to calculating the Number of Days in a Month
Answer 1：找出当月的天数
selectdatepart(dd,dateadd(dd,-1,dateadd(mm,1,cast(cast(year(getdate()) asvarchar)+'-'+cast(month(getdate()) as varchar)+'-01' as datetime))))

Question2：Can you use a SQL statement to calculating it!
Howcan I print "10 to 20" for books that sell for between $10 and$20，"unknown" for books whose price is null, and "other" for all otherprices?
Answer 2：
select bookid,bookname,price=case when price is null then 'unknown'
       when  price between 10 and 20 then '10 to 20' else price end
from books

Question3：Can you use a SQL statement to finding duplicate values!
How can I find authors with the same last name?
You can use the table authors in datatabase pubs. I want to get the result as below:
Output:
au_lname                                 number_dups
---------------------------------------- -----------
Ringer                                   2
(1 row(s) affected)
Answer 3
select au_lname,number_dups=count(1) from authors group by au_lname

Question4：Can you create a cross-tab report in my SQL Server!
Howcan I get the report about sale quality for each store and each quarterand the total sale quality for each quarter at year 1993?
You can use the table sales and stores in datatabase pubs.
TableSales record all sale detail item for each store. Column store_id isthe id of each store, ord_date is the order date of each sale item, andcolumn qty is the sale qulity. Table stores record all storeinformation.
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
Bookbeat                                 55          25          30          0           0
Doc-U-Mat: Quality Laundry and Books     85          0