Question2：Can you use a SQL statement to calculating it!
How can 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 other prices?
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!
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
Bookbeat 55 25 30 0 0
Doc-U-Mat: Quality Laundry and Books 85 0 85 0 0
Fricative Bookshop 60 35 0 0 25
Total 250 60 165 0 25
Answer 4：用動(dòng)態(tài)SQL實(shí)現
Question5: The Fastest Way to Recompile All Stored Procedures
I have a problem with a database running in SQL Server 6.5 (Service Pack 4). We moved the database (object transfer) from one machine to another last night, and an error (specific to a stored procedure) is cropping up. However, I can‘t tell which procedure is causing it. Permissions are granted in all of our stored procedures; is there a way from the isql utility to force all stored procedures to recompile?
Tips: sp_recompile can recomplie a store procedure each time
Answer 5：在執行存儲過(guò)程時(shí),使用 with recompile 選項強制編譯新的計劃；使用sp_recompile系統存儲過(guò)程強制在下次運行時(shí)進(jìn)行重新編譯
Question6: How can I add row numbers to my result set?
In database pubs, have a table titles , now I want the result shown as below,each row have a row number, how can you do that?
Result:
Answer 6： line-no title_id
----------- --------
1 BU1032
2 BU1111
3 BU2075
4 BU7832
5 MC2222
6 MC3021
7 MC3026
8 PC1035
9 PC8888
10 PC9999
11 PS1372
12 PS2091
13 PS2106
14 PS3333
15 PS7777
16 TC3218
17 TC4203
18 TC7777
--SQL 2005的寫(xiě)法
select row_number() as line_no ,title_id from titles
--SQL 2000的寫(xiě)法
select line_no identity(int,1,1),title_id into #t from titles
select * from #t
drop table #t
Question 7: Can you tell me what the difference of two SQL statements at performance of execution?
Statement 1:
if NOT EXISTS ( select * from publishers where state = ‘NY‘)
begin
SELECT ‘Sales force needs to penetrate New York market‘
end
else
begin
SELECT ‘We have publishers in New York‘
end
Statement 2:
if EXISTS ( select * from publishers where state = ‘NY‘)
begin
SELECT ‘We have publishers in New York‘
end
else
begin
SELECT ‘Sales force needs to penetrate New York market‘
end
Answer 7：不同點(diǎn):執行時(shí)的事務(wù)數,處理時(shí)間,從客戶(hù)端到服務(wù)器端傳送的數據量大小
Question8: How can I list all California authors regardless of whether they have written a book?
In database pubs, have a table authors and titleauthor , table authors has a column state, and titleauhtor have books each author written.
CA behalf of california in table authors.
Answer 8：
select * from authors where state=‘CA‘
Question9: How can I get a list of the stores that have bought both ‘bussiness‘ and ‘mod_cook‘ type books? stor_id stor_name
In database pubs, use three table stores,sales and titles to implement this requestment.
Now I want to get the result as below:
------- ----------------------------------------
...
7896 Fricative Bookshop
...
...
...
Answer 9：
select distinct a.stor_id, a.stor_name from stores a,sales b,titles c
where a.stor_id=b.stor_id and b.title_id=c.title_id and c.type=‘business‘ and
exists(select 1 from sales k,titles g where stor_id=b.stor_id
and k.title_id=g.title_id and g.type=‘mod_cook‘)
Question10: How can I list non-contignous data? create table test insert into test values (1 ) Now I want to list the result of the non-contignous row as below,how can I do it?
In database pubs, I create a table test using statement as below, and I insert several row as below
( id int primary key )
go
insert into test values (2 )
insert into test values (3 )
insert into test values (4 )
insert into test values (5 )
insert into test values (6 )
insert into test values (8 )
insert into test values (9 )
insert into test values (11)
insert into test values (12)
insert into test values (13)
insert into test values (14)
insert into test values (18)
insert into test values (19)
go
Missing after Missing before
------------- --------------
6 8
9 11
...
Answer 10：
select id from test t where not exists(select 1 from test where id=t.id+1)
or not exists(select 1 from test where id=t.id-1)
Question11: How can I list all book with prices greather than the average price of books of the same type?
In database pubs, have a table named titles , its column named price mean the price of the book, and another named type mean the type of books.
Now I want to get the result as below:
Answer 11： type title price
------------ -------------------------------------------------------------------------------- ---------------------
business The Busy Executive‘s Database Guide 19.9900
...
...
...
...
select a.type,a.title,a.price from titles a,
(select type,price=avg(price) from titles group by type)b
where a.type=b.type and a.price>b.price
試題點(diǎn)評：通覽整個(gè)試題，我們不難發(fā)現，這份試題是針對SQL Server數據庫人員的。而從難度分析上來(lái)看，這份試題也屬于同類(lèi)試題中比較難的了。之所以說(shuō)它難，首先是限定時(shí)間的全英文試題；其次，盡管這份試題主要是考核開(kāi)發(fā)能力，但卻涉及到了算法的選擇和性能的調優(yōu)；最后，這份試題還夾進(jìn)了SQL Server數據庫的升級問(wèn)題。因此，綜上所述，我們估計這是一家從事程序外包工作的外企招聘后臺開(kāi)發(fā)或與后臺開(kāi)發(fā)相關(guān)的SQL Server高級程序員的試題。
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