Beginning SQL

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Installing and Using IBM DB2 A free trial version of IBM DB2 for development purposes can be downloaded from the IBM Web site. The good news is that it’s free to download; the bad news is that it’s a huge, huge download even if you have a broadband connection. The current URL for the download page is www14.software. ibm.com/webapp/download/product.jsp?id=TDUN-49EVGU&q=%20DB2+Personal+Developer. Download the DB2 Personal Developer’s Edition suitable for your operating system. Having downloaded the installation, you’ll almost certainly find that it’s a single compressed file that needs to be uncompressed before installation can take place. Simply run the downloaded file and select where you want to extract it. Anywhere on your hard drive is fine; just make sure you have plenty of space because it’s a big file. This appendix guides you through the Windows installation, but the principles are the same for whichever operating system you’re using. To start the installation you need to run the setup program. Click Start ➪ Run and browse to where you extracted the setup files. Double-click setup.exe, and then click OK in the Run dialog box to start the installation. It might take a little while depending on how fast your computer is, but eventually the first screen (see Figure B-31) of the installation appears: Figure B-31 Setting Up and Using the Five Database Systems You may wish to double-check that your PC has the required prerequisites; once you’ve done that, click on the Install Product link. A screen (shown in Figure B-32) allowing you to choose which product to install appears, though usually it’s an option of one! 409
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Beginning SQL Paul Wilton and John
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Beginning SQL Paul Wilton and John
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About the Authors Paul Wilton After
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Paul Wilton: With lots of love to m
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Contents x Selecting Correct Data T
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Contents xii Re-examining NULL 180
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Contents Chapter 11: Transactions 3
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Contents xvi How Do You Do It? 357
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Introduction Data, data, data! Data
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By the time you’ve completed Chap
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Once you download the code, just de
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1 Introduction to SQL A nice, gentl
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Figure 1-1 Why and When to Use a Da
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Databases are great at dealing with
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The SQL language is actually fairly
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you wish, and the database system d
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A keyword is a word that has some m
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Introduction to SQL A perfectly val
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Data Type Description Storage Used
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The char and varchar data types use
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Most RDBMSs handle the most common
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To add a new column, use the basic
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Now that you know what you want to
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❑ Meeting date 2 ❑ Location 2
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Generally speaking, picking a data
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example, the MemberId field links t
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Depending on which RDBMS you’re u
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The FilmCategory table is very smal
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2 Entering Information The last cha
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like this: INSERT INTO Category VAL
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Inserting Data into the Case Study
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The WHERE Clause So far you’ve se
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Try It Out Using Logical Operators
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Exercises 1. Three new members have
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Chapter 3 54 MemberId FirstName 1 K
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Chapter 3 The results are as follow
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Chapter 3 The results to this query
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Chapter 3 FavCategory (CategoryId,
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Chapter 3 Logical Operators and Ope
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Chapter 3 The statement returns the
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Chapter 3 NOT Operator Examples thu
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Chapter 3 2. Using the following SQ
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Chapter 3 When you execute the quer
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Chapter 3 Now that you’re acquain
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Chapter 3 It’s as simple as that!
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Chapter 3 76 YearReleased 1947 1967
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Chapter 3 78 FilmName Rating Gone w
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Chapter 3 2. Add a WHERE clause to
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Chapter 3 Executing this SQL provid
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Chapter 3 84 FullName First name is
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Chapter 3 86 FullName First name is
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Chapter 3 Even though DateOfBirth i
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Chapter 3 Member Name The member is
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Chapter 3 92 The preceding SQL prod
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Chapter 3 94 ❑ Category ❑ FavCa
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Chapter 3 96 You’re one step furt
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Chapter 3 98 FirstName LastName Cat
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Chapter 3 This time, you achieve mo
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Chapter 3 SQL Is Set-Based 102 You
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Chapter 3 104 Category MemberId Thr
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Chapter 3 106 You should see the fo
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Chapter 3 The overlapping portions
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Chapter 3 110 More than one conditi
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Chapter 3 112 Next, link the Member
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Chapter 3 114 FirstName LastName Da
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Chapter 3 ❑ The slightly tricky t
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Chapter 4 normalization can make da
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Chapter 4 120 Field Name Data Type
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Chapter 4 122 The Street, City, and
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Chapter 4 MySQL versions prior to 5
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Chapter 4 126 Except for IBM’s DB
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Chapter 4 128 You can add more than
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Chapter 4 Try It Out Adding a CHECK
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Chapter 4 Obviously, if the table i
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Chapter 4 134 Drop the MoreHolidayB
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Chapter 4 136 If you want to return
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Chapter 4 If you’re using IBM DB2
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Chapter 4 140 index helps speed up
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Chapter 4 142 The results you get m
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Chapter 4 144 The results of the qu
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Chapter 4 146 Remember, IBM DB2 doe
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Chapter 4 148 UPDATE Films SET Film
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Chapter 4 150 Finally, you do the s
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Chapter 4 152 SELECT * FROM MemberD
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Chapter 4 ❑ Choose meaningful nam
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5 Manipulating Data In Chapter 3, y
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The results of this query are as fo
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You can raise a number to any power
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To demonstrate the sort of results
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The CEILING() Function The CEILING(
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ased on the digits after the decima
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The SUBSTRING() function works at t
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LastName UPPER(LastName) LOWER(Last
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The LENGTH() function takes just on
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LastName LOWER(SUBSTRING(LastName,1
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FirstName DIFFERENCE(FirstName, ‘
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Converting Different Data Types Thi
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CREATE Table MyTable(FirstColumn in
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The COALESCE() Function The COALESC
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Ideally, this first argument is the
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LocationId Street City State 1 Main
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6 Grouping and Aggregating Data So
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Running the query, complete with a
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MemberId Street City State 11 Newis
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Executing the SQL returns seven dis
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For example, the following code add
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Running the query gives the answer
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SELECT MAX(LastName), MIN(LastName)
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immediately after the GROUP BY stat
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Executing the final SQL provides th
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Chapter 7 The INNER JOIN links the
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Chapter 7 FilmName FirstName LastNa
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Chapter 7 212 As mentioned, that wo
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Chapter 7 Category Street Romance T
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Chapter 7 216 MD1.First MD1.Last MD
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Chapter 7 SELECT MD1.MemberId, MD1.
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Chapter 7 220 SELECT Category, Film
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Chapter 7 222 Location.Street Membe
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Chapter 7 224 Category MemberId War
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Chapter 7 Look at the results that
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Chapter 7 228 The Maltese Poodle 8
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Chapter 7 230 9 10 11 12 13 14 15 1
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Chapter 7 232 On Golden Puddle 1967
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8 Queries within Queries This chapt
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There are no films with a value in
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The error wording depends on the da
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Now execute the query. You receive
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The query provides the following re
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If you execute this query, you can
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To obtain the same results as you w
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MemberId 1 10 14 6 5 8 7 11 15 4 13
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Now NOT EXISTS returns true, and as
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This is the same as the query just
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clause specifying that the film’s
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4. Next, quickly double-check a few
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Now that you’ve confirmed that th
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Summary Queries within Queries This
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Chapter 9 264 Figure 9-1 The SQL ne
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Chapter 9 266 INSERT INTO OrderItem
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Chapter 9 268 VALUES (5,7, 2,’200
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Chapter 9 Now that you’ve added t
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Chapter 9 272 FirstName LastName Mo
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Chapter 9 274 DVDPrice column is in
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Chapter 9 SalesPersonId FirstName L
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Chapter 9 278 SalesPersonId MemberI
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Chapter 9 280 SalesPersonId MemberI
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Chapter 9 282 MemberDetails.FirstNa
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Chapter 9 284 The query would work
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Chapter 9 Exercises 286 Assume that
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Chapter 10 Now that you know what v
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Chapter 10 Types of Views Given tha
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Chapter 10 Perhaps you need to view
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Chapter 10 Figure 10-7 Summary view
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Chapter 10 296 This statement gives
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Chapter 10 The CHECK OPTION plays a
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11 Transactions When you move out o
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Example Data This section creates e
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3. Build a record in the Rentals ta
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The other statement that the ANSI S
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SAVE TRANSACTION Select Update Begi
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Figure 11-5 Begin Transaction Delet
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In spite of all of these performanc
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Shared A shared lock essentially me
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of record locks, the DBMS may decid
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No updates, additions, or deletions
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International Board Manufacturer ha
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contention. You could wrap your new
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Summary Transactions ensure that us
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Chapter 12 328 SQL security is cent
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Chapter 12 Creating User IDs Figure
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Chapter 12 3. In the SQL window, ty
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Chapter 12 ❑ You can assign a dif
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Chapter 12 Privileges Privileges ar
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Chapter 12 338 You could then give
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Chapter 12 You might implement this
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Chapter 12 Another shortcut, using
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Chapter 12 As you can imagine, givi
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Chapter 12 The situation gets a lit
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Chapter 12 Summary Database securit
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Chapter 13 robust, fault-tolerant m
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Chapter 13 Gigahertz Networks or Co
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Chapter 13 Database Cache 354 In ad
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Chapter 13 Again, the shotgun appro
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Chapter 13 358 Figure 13-3 Leaf Ind
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Chapter 13 Try It Out Dropping Inde
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Chapter 13 64k Block 64k Block Figu
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Chapter 13 ❑ Inner joins look lik
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Chapter 1 Exercise 1 Solution A Exe
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Chapter 2 Exercise 1 Solution There
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Email, DateOfJoining ) VALUES ( 7,
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Chapter 3 Exercise 1 Solution First
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As well as joining the tables, you
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Figure A-2 Notice that Table1 is re
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Executing the query provides the fo
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Category COUNT(DVDPrice), SUM(DVDPr
Page 806: This is the final SQL and gives the
Page 810: The results from the query are as f
Page 814: Clearly this query hasn’t returne
Page 818: Chapter 12 Exercise 1 Solution EXEC
Page 822: B Setting Up and Using the Five Dat
Page 826: Next, you come to a screen that giv
Page 830: Leave the check box for “Configur
Page 834: For this book, the default option o
Page 838: Now click Next to continue. In the
Page 842: Click Finish, and congratulate your
Page 846: Figure B-22 Click Ignore to continu
Page 850: Figure B-26 Click the Add New Conne
Page 854: Figure B-29 Click the triangle next
Page 860: Appendix B 410 Figure B-32 Click Ne
Page 864: Appendix B 412 Click Next to contin
Page 868: Appendix B 414 Click OK to clear th
Page 872: Appendix B If you’re ready and ha
Page 876: Appendix B 418 You can also enter a
Page 880: Appendix B 420 Figure B-49 The Film
Page 884: Appendix B 422 Now you need to inse
Page 888: Appendix B 424 In Access it’s not
Page 892: Appendix B 426 Figure B-56 You need
Page 896: Appendix B 428 Then click the Run i
Page 900: Appendix B 430 The next screen (see
Page 904: Appendix B 432 On the next screen,
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Appendix B 434 Click Next to procee
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Appendix B 436 Figure B-72 The huge
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Appendix B 438 Figure B-74 Notice t
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Appendix B 440 Figure B-76 The Obje
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Appendix B 442 Figure B-78 Chapter
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Appendix B You don’t need MyTable
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Appendix B 446 Figure B-82 To begin
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Appendix B Using Oracle’s SQL*Plu
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Appendix B 450 Figure B-87 Another
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Appendix C Category Table The follo
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Appendix C 454 ( 3, ‘Sandra’,
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Appendix C 456 ZipCode, Email, Date
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Appendix C DateOfJoining ) VALUES (
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Appendix C 460 VALUES ( 1, 3 ); INS
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Appendix C VALUES ( 5, 3 ); INSERT
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Appendix C 464 3 ); INSERT INTO Fil
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Appendix C 5, 6 ); INSERT INTO Film
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Appendix C 468 5 ); INSERT INTO Att
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Appendix C Oracle 470 To save some
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Appendix C 472 LocationId, MeetingD
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Symbols + (addition operator), 82,
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BEGIN TRANSACTION statement, 306, 3
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SERIALIZABLE statement, 318 SET TRA
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data types brackets, 25 categories,
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Oracle concatenation, 85-88 configu
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error messages debugging, 26 subque
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concatenation, 85-88 data type comp
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primary keys database creation exam
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concurrent connection selection, 39
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passwords group access, 333 IBM ins
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ROLLBACK statement, 307-308 ROLLBAC
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REPEATABLE READ, 319 REVOKE, 344-34
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telephone numbers, data type select
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historical, data selection, 90-94 N
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