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Table Expressions in Microsoft SQL Server 2008 T-SQL

Exercises

This section provides exercises to help you familiarize yourself with the subjects discussed in this chapter. All the exercises in this chapter require your session to be connected to the database TSQLFundamentals2008.

1-1

Write a query that returns the maximum order date for each employee.

Tables involved: TSQLFundamentals2008 database, Sales.Orders table.

Desired output:

empid       maxorderdate
----------- -----------------------
3           2008-04-30 00:00:00.000
6           2008-04-23 00:00:00.000
9           2008-04-29 00:00:00.000
7           2008-05-06 00:00:00.000
1           2008-05-06 00:00:00.000
4           2008-05-06 00:00:00.000
2           2008-05-05 00:00:00.000
5           2008-04-22 00:00:00.000
8           2008-05-06 00:00:00.000

(9 row(s) affected)

1-2

Encapsulate the query from Exercise 1-1 in a derived table. Write a join query between the derived table and the Orders table to return the orders with the maximum order date for each employee.

Tables involved: Sales.Orders.

Desired output:

empid       orderdate                 orderid     custid
----------- ------------------------- ----------- -----------
9           2008-04-29 00:00:00.000   11058       6
8           2008-05-06 00:00:00.000   11075       68
7           2008-05-06 00:00:00.000   11074       73
6           2008-04-23 00:00:00.000   11045       10
5           2008-04-22 00:00:00.000   11043       74
4           2008-05-06 00:00:00.000   11076       9
3           2008-04-30 00:00:00.000   11063       37
2           2008-05-05 00:00:00.000   11073       58
2           2008-05-05 00:00:00.000   11070       44
1           2008-05-06 00:00:00.000   11077       65

(10 row(s) affected)

2-1

Write a query that calculates a row number for each order based on orderdate, orderid ordering.

Tables involved: Sales.Orders.

Desired output (abbreviated):

orderid     orderdate                 custid      empid       rownum
----------- ------------------------- ----------- ----------- -------
10248       2006-07-04 00:00:00.000   85          5           1
10249       2006-07-05 00:00:00.000   79          6           2
10250       2006-07-08 00:00:00.000   34          4           3
10251       2006-07-08 00:00:00.000   84          3           4
10252       2006-07-09 00:00:00.000   76          4           5
10253       2006-07-10 00:00:00.000   34          3           6
10254       2006-07-11 00:00:00.000   14          5           7
10255       2006-07-12 00:00:00.000   68          9           8
10256       2006-07-15 00:00:00.000   88          3           9
10257       2006-07-16 00:00:00.000   35          4           10
...

(830 row(s) affected)

2-2

Write a query that returns rows with row numbers 11 through 20 based on the row number definition in Exercise 2-1. Use a CTE to encapsulate the code from Exercise 2-1.

Tables involved: Sales.Orders.

Desired output:

orderid     orderdate                 custid      empid       rownum
----------- ------------------------- ----------- ----------- -------
10258       2006-07-17 00:00:00.000   20          1           11
10259       2006-07-18 00:00:00.000   13          4           12
10260       2006-07-19 00:00:00.000   56          4           13
10261       2006-07-19 00:00:00.000   61          4           14
10262       2006-07-22 00:00:00.000   65          8           15
10263       2006-07-23 00:00:00.000   20          9           16
10264       2006-07-24 00:00:00.000   24          6           17
10265       2006-07-25 00:00:00.000   7           2           18
10266       2006-07-26 00:00:00.000   87          3           19
10267       2006-07-29 00:00:00.000   25          4           20

(10 row(s) affected)

3

Write a solution using a recursive CTE that returns the management chain leading to Zoya Dolgopyatova (employee ID 9).

Tables involved: HR.Employees.

Desired output:

empid       mgrid       firstname  lastname
----------- ----------- ---------- --------------------
9           5           Zoya       Dolgopyatova
5           2           Sven       Buck
2           1           Don        Funk
1           NULL        Sara       Davis

(4 row(s) affected)

4-1

Create a view that returns the total quantity for each employee and year.

Tables involved: Sales.Orders and Sales.OrderDetails.

When running the following code:

SELECT * FROM Sales.VEmpOrders ORDER BY empid, orderyear;

The desired output is:

empid       orderyear    qty
----------- ----------- -----------
1           2006        1620
1           2007        3877
1           2008        2315
2           2006        1085
2           2007        2604
2           2008        2366
3           2006        940
3           2007        4436
3           2008        2476
4           2006        2212
4           2007        5273
4           2008        2313
5           2006        778
5           2007        1471
5           2008        787
6           2006        963
6           2007        1738
6           2008        826
7           2006        485
7           2007        2292
7           2008        1877
8           2006        923
8           2007        2843
8           2008        2147
9           2006        575
9           2007        955
9           2008        1140

(27 row(s) affected)

4-2(Optional, Advanced)

Write a query against Sales.VEmpOrders that returns the running total quantity for each employee and year.

Tables involved: Sales.VEmpOrders view.

Desired output:

empid       orderyear   qty         runqty
----------- ----------- ----------- ----------
1           2006        1620        1620
1           2007        3877        5497
1           2008        2315        7812
2           2006        1085        1085
2           2007        2604        3689
2           2008        2366        6055
3           2006        940         940

3           2007        4436        5376
3           2008        2476        7852
4           2006        2212        2212
4           2007        5273        7485
4           2008        2313        9798
5           2006        778         778
5           2007        1471        2249
5           2008        787         3036
6           2006        963         963
6           2007        1738        2701
6           2008        826         3527
7           2006        485         485
7           2007        2292        2777
7           2008        1877        4654
8           2006        923         923
8           2007        2843        3766
8           2008        2147        5913
9           2006        575         575
9           2007        955         1530
9           2008        1140        2670
(27 row(s) affected)

5-1

Create an inline function that accepts as inputs a supplier ID (@supid AS INT) and a requested number of products (@n AS INT). The function should return @n products with the highest unit prices that are supplied by the given supplier ID.

Tables involved: Production.Products.

When issuing the following query:

SELECT * FROM Production.fn_TopProducts(5, 2);

Desired output:

productid   productname        unitprice
----------- ------------------ ---------------
12          Product OSFNS      38.00
11          Product QMVUN      21.00

(2 row(s) affected)

5-2

Using the CROSS APPLY operator and the function you created in Exercise 4-1, return, for each supplier, the two most expensive products.

Desired output:

supplierid  companyname       productid   productname     unitprice
----------- ----------------- ----------- --------------- ----------
8           Supplier BWGYE    20          Product QHFFP   81.00
8           Supplier BWGYE    68          Product TBTBL   12.50
20          Supplier CIYNM    43          Product ZZZHR   46.00
20          Supplier CIYNM    44          Product VJIEO   19.45
23          Supplier ELCRN    49          Product FPYPN   20.00
23          Supplier ELCRN    76          Product JYGFE   18.00
5           Supplier EQPNC    12          Product OSFNS   38.00
5           Supplier EQPNC    11          Product QMVUN   21.00
...
(55 row(s) affected)