Chapter 04 - Subqueries - Solutions

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-- Microsoft SQL Server 2008 T-SQL Fundamentals

-- Chapter 4 - Subqueries

-- Solutions

-- ?2008 Itzik Ben-Gan

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-- 1

-- Write a query that returns all orders placed on the last day of

-- activity that can be found in the Orders table

-- Tables involved: TSQLFundamentals2008 database, Orders table

--Desired output

orderid orderdate custid empid

----------- ----------------------- ----------- -----------

11077 2008-05-06 00:00:00.000 65 1

11076 2008-05-06 00:00:00.000 9 4

11075 2008-05-06 00:00:00.000 68 8

11074 2008-05-06 00:00:00.000 73 7

(4 row(s) affected)

-- Solution

USE TSQLFundamentals2008;

SELECT orderid, orderdate, custid, empid

FROM Sales.Orders

WHERE orderdate =

(SELECT MAX(O.orderdate) FROM Sales.Orders AS O);

-- 2 (Optional, Advanced)

-- Write a query that returns all orders placed

-- by the customer(s) who placed the highest number of orders

-- * Note: there may be more than one customer

-- with the same number of orders

-- Tables involved: TSQLFundamentals2008 database, Orders table

-- Desired output:

custid orderid orderdate empid

----------- ----------- ----------------------- -----------

71 10324 2006-10-08 00:00:00.000 9

71 10393 2006-12-25 00:00:00.000 1

71 10398 2006-12-30 00:00:00.000 2

71 10440 2007-02-10 00:00:00.000 4

71 10452 2007-02-20 00:00:00.000 8

71 10510 2007-04-18 00:00:00.000 6

71 10555 2007-06-02 00:00:00.000 6

71 10603 2007-07-18 00:00:00.000 8

71 10607 2007-07-22 00:00:00.000 5

71 10612 2007-07-28 00:00:00.000 1

71 10627 2007-08-11 00:00:00.000 8

71 10657 2007-09-04 00:00:00.000 2

71 10678 2007-09-23 00:00:00.000 7

71 10700 2007-10-10 00:00:00.000 3

71 10711 2007-10-21 00:00:00.000 5

71 10713 2007-10-22 00:00:00.000 1

71 10714 2007-10-22 00:00:00.000 5

71 10722 2007-10-29 00:00:00.000 8

71 10748 2007-11-20 00:00:00.000 3

71 10757 2007-11-27 00:00:00.000 6

71 10815 2008-01-05 00:00:00.000 2

71 10847 2008-01-22 00:00:00.000 4

71 10882 2008-02-11 00:00:00.000 4

71 10894 2008-02-18 00:00:00.000 1

71 10941 2008-03-11 00:00:00.000 7

71 10983 2008-03-27 00:00:00.000 2

71 10984 2008-03-30 00:00:00.000 1

71 11002 2008-04-06 00:00:00.000 4

71 11030 2008-04-17 00:00:00.000 7

71 11031 2008-04-17 00:00:00.000 6

71 11064 2008-05-01 00:00:00.000 1

(31 row(s) affected)

-- Solution

SELECT custid, orderid, orderdate, empid

FROM Sales.Orders

WHERE custid IN

(SELECT TOP (1) WITH TIES O.custid

FROM Sales.Orders AS O

GROUP BY O.custid

ORDER BY COUNT(*) DESC);

-- 3

-- Write a query that returns employees

-- who did not place orders on or after May 1st, 2008

-- Tables involved: TSQLFundamentals2008 database, Employees and Orders tables

-- Desired output:

empid FirstName lastname

----------- ---------- --------------------

3 Judy Lew

5 Sven Buck

6 Paul Suurs

9 Zoya Dolgopyatova

(4 row(s) affected)

-- Solution

SELECT empid, FirstName, lastname

FROM HR.Employees

WHERE empid NOT IN

(SELECT O.empid

FROM Sales.Orders AS O

WHERE O.orderdate >= '20080501');

-- 4

-- Write a query that returns

-- countries where there are customers but not employees

-- Tables involved: TSQLFundamentals2008 database, Customers and Employees tables

-- Desired output:

country

---------------

Argentina

Austria

Belgium

Brazil

Canada

Denmark

Finland

France

Germany

Ireland

Italy

Mexico

Norway

Poland

Portugal

Spain

Sweden

Switzerland

Venezuela

(19 row(s) affected)

-- Solution

SELECT DISTINCT country

FROM Sales.Customers

WHERE country NOT IN

(SELECT E.country FROM HR.Employees AS E);

-- 5

-- Write a query that returns for each customer

-- all orders placed on the customer's last day of activity

-- Tables involved: TSQLFundamentals2008 database, Orders table

-- Desired output:

custid orderid orderdate empid

----------- ----------- ----------------------- -----------

1 11011 2008-04-09 00:00:00.000 3

2 10926 2008-03-04 00:00:00.000 4

3 10856 2008-01-28 00:00:00.000 3

4 11016 2008-04-10 00:00:00.000 9

5 10924 2008-03-04 00:00:00.000 3

...

87 11025 2008-04-15 00:00:00.000 6

88 10935 2008-03-09 00:00:00.000 4

89 11066 2008-05-01 00:00:00.000 7

90 11005 2008-04-07 00:00:00.000 2

91 11044 2008-04-23 00:00:00.000 4

(90 row(s) affected)

-- Solution

SELECT custid, orderid, orderdate, empid

FROM Sales.Orders AS O1

WHERE orderdate =

(SELECT MAX(O2.orderdate)

FROM Sales.Orders AS O2

WHERE O2.custid = O1.custid)

ORDER BY custid;

-- 6

-- Write a query that returns customers

-- who placed orders in 2007 but not in 2008

-- Tables involved: TSQLFundamentals2008 database, Customers and Orders tables

-- Desired output:

custid companyname

----------- ----------------------------------------

21 Customer KIDPX

23 Customer WVFAF

33 Customer FVXPQ

36 Customer LVJSO

43 Customer UISOJ

51 Customer PVDZC

85 Customer ENQZT

(7 row(s) affected)

-- Solution

SELECT custid, companyname

FROM Sales.Customers AS C

WHERE EXISTS

(SELECT *

FROM Sales.Orders AS O

WHERE O.custid = C.custid

AND O.orderdate >= '20070101'

AND O.orderdate < '20080101')

AND NOT EXISTS

(SELECT *

FROM Sales.Orders AS O

WHERE O.custid = C.custid

AND O.orderdate >= '20080101'

AND O.orderdate < '20090101');

-- 7 (Optional, Advanced)

-- Write a query that returns customers

-- who ordered product 12

-- Tables involved: TSQLFundamentals2008 database,

-- Customers, Orders and OrderDetails tables

-- Desired output:

custid companyname

----------- ----------------------------------------

48 Customer DVFMB

39 Customer GLLAG

71 Customer LCOUJ

65 Customer NYUHS

44 Customer OXFRU

51 Customer PVDZC

86 Customer SNXOJ

20 Customer THHDP

90 Customer XBBVR

46 Customer XPNIK

31 Customer YJCBX

87 Customer ZHYOS

(12 row(s) affected)

-- Solution

SELECT custid, companyname

FROM Sales.Customers AS C

WHERE EXISTS

(SELECT *

FROM Sales.Orders AS O

WHERE O.custid = C.custid

AND EXISTS

(SELECT *

FROM Sales.OrderDetails AS OD

WHERE OD.orderid = O.orderid

AND OD.ProductID = 12));

-- 8 (Optional, Advanced)

-- Write a query that calculates a running total qty

-- for each customer and month

-- Tables involved: TSQLFundamentals2008 database, Sales.CustOrders view

-- Desired output:

custid ordermonth qty runqty

----------- ----------------------- ----------- -----------

1 2007-08-01 00:00:00.000 38 38

1 2007-10-01 00:00:00.000 41 79

1 2008-01-01 00:00:00.000 17 96

1 2008-03-01 00:00:00.000 18 114

1 2008-04-01 00:00:00.000 60 174

2 2006-09-01 00:00:00.000 6 6

2 2007-08-01 00:00:00.000 18 24

2 2007-11-01 00:00:00.000 10 34

2 2008-03-01 00:00:00.000 29 63

3 2006-11-01 00:00:00.000 24 24

3 2007-04-01 00:00:00.000 30 54

3 2007-05-01 00:00:00.000 80 134

3 2007-06-01 00:00:00.000 83 217

3 2007-09-01 00:00:00.000 102 319

3 2008-01-01 00:00:00.000 40 359

...

(636 row(s) affected)

-- Solution

SELECT custid, ordermonth, qty,

(SELECT SUM(O2.qty)

FROM Sales.CustOrders AS O2

WHERE O2.custid = O1.custid

AND O2.ordermonth <= O1.ordermonth) AS runqty

FROM Sales.CustOrders AS O1

ORDER BY custid, ordermonth;