Beginning SQL

More documents

Recommendations

Info

FROM dbo.MemberDetails INNER JOIN dbo.Attendance ON dbo.MemberDetails.MemberId = dbo.Attendance.MemberId INNER JOIN dbo.Location ON dbo.Attendance.LocationId = dbo.Location.LocationId Having run this <strong>SQL</strong> statement, you now have a view named MemberAttendance. If you build a query selecting all the fields from that view, you end up with a much more readable statement: SELECT LastName, FirstName, DateOfBirth, Street, City, State, ZipCode, Email, DateOfJoining, MeetingDate, MemberAttended, [Meeting Street], [Meeting City], [Meeting State] FROM MemberAttendance Executing this statement provides the following results shown in Figure 10-2. Figure 10-2 More important, you now have a base upon which you can build the various queries you might want. The name of the base view, MemberAttendance, is used in the subsequent query just as if it were a real table, and the field names from that view are used just as if they were real field names in a real table. In appearance, MemberAttendance is a table. As you have just seen, however, it is not, but rather a query pulling specific fields from specific tables. Because the view definition is saved in the database, the DBMS can perform all the necessary work required to translate the <strong>SQL</strong> statement into a data set, which is then presented to the new query to use as if it really were a table. Row Views Using a WHERE clause to filter down a results set is often useful when pulling all of the fields for a given set of records. Row views are views that select a subset of all the rows in the larger dataset. Perhaps you want to pull the records for all the members who attended any meetings. SELECT MemberAttendance.* FROM MemberAttendance WHERE (MemberAttended = ‘Y’) ORDER BY LastName, FirstName, MeetingDate Should you need to build other views of members who actively attend meetings, you could simply save this query as a view: CREATE VIEW ActiveMemberAttendance AS SELECT MemberAttendance.* FROM MemberAttendance WHERE (MemberAttended = ‘Y’) ORDER BY LastName, FirstName, MeetingDate Views 291
Page 2:
Beginning SQL Paul Wilton and John
Page 10:
Beginning SQL Paul Wilton and John
Page 14:
About the Authors Paul Wilton After
Page 18:
Paul Wilton: With lots of love to m
Page 24:
Contents x Selecting Correct Data T
Page 28:
Contents xii Re-examining NULL 180
Page 32:
Contents Chapter 11: Transactions 3
Page 36:
Contents xvi How Do You Do It? 357
Page 42:
Introduction Data, data, data! Data
Page 46:
By the time you’ve completed Chap
Page 50:
Once you download the code, just de
Page 54:
1 Introduction to SQL A nice, gentl
Page 58:
Figure 1-1 Why and When to Use a Da
Page 62:
Databases are great at dealing with
Page 66:
The SQL language is actually fairly
Page 70:
you wish, and the database system d
Page 74:
A keyword is a word that has some m
Page 78:
Introduction to SQL A perfectly val
Page 82:
Data Type Description Storage Used
Page 86:
The char and varchar data types use
Page 90:
Most RDBMSs handle the most common
Page 94:
To add a new column, use the basic
Page 98:
Now that you know what you want to
Page 102:
❑ Meeting date 2 ❑ Location 2
Page 106:
Generally speaking, picking a data
Page 110:
example, the MemberId field links t
Page 114:
Depending on which RDBMS you’re u
Page 118:
The FilmCategory table is very smal
Page 122:
2 Entering Information The last cha
Page 126:
like this: INSERT INTO Category VAL
Page 130:
Inserting Data into the Case Study
Page 134:
The WHERE Clause So far you’ve se
Page 138:
Try It Out Using Logical Operators
Page 142:
Exercises 1. Three new members have
Page 148:
Chapter 3 54 MemberId FirstName 1 K
Page 152:
Chapter 3 The results are as follow
Page 156:
Chapter 3 The results to this query
Page 160:
Chapter 3 FavCategory (CategoryId,
Page 164:
Chapter 3 Logical Operators and Ope
Page 168:
Chapter 3 The statement returns the
Page 172:
Chapter 3 NOT Operator Examples thu
Page 176:
Chapter 3 2. Using the following SQ
Page 180:
Chapter 3 When you execute the quer
Page 184:
Chapter 3 Now that you’re acquain
Page 188:
Chapter 3 It’s as simple as that!
Page 192:
Chapter 3 76 YearReleased 1947 1967
Page 196:
Chapter 3 78 FilmName Rating Gone w
Page 200:
Chapter 3 2. Add a WHERE clause to
Page 204:
Chapter 3 Executing this SQL provid
Page 208:
Chapter 3 84 FullName First name is
Page 212:
Chapter 3 86 FullName First name is
Page 216:
Chapter 3 Even though DateOfBirth i
Page 220:
Chapter 3 Member Name The member is
Page 224:
Chapter 3 92 The preceding SQL prod
Page 228:
Chapter 3 94 ❑ Category ❑ FavCa
Page 232:
Chapter 3 96 You’re one step furt
Page 236:
Chapter 3 98 FirstName LastName Cat
Page 240:
Chapter 3 This time, you achieve mo
Page 244:
Chapter 3 SQL Is Set-Based 102 You
Page 248:
Chapter 3 104 Category MemberId Thr
Page 252:
Chapter 3 106 You should see the fo
Page 256:
Chapter 3 The overlapping portions
Page 260:
Chapter 3 110 More than one conditi
Page 264:
Chapter 3 112 Next, link the Member
Page 268:
Chapter 3 114 FirstName LastName Da
Page 272:
Chapter 3 ❑ The slightly tricky t
Page 276:
Chapter 4 normalization can make da
Page 280:
Chapter 4 120 Field Name Data Type
Page 284:
Chapter 4 122 The Street, City, and
Page 288:
Chapter 4 MySQL versions prior to 5
Page 292:
Chapter 4 126 Except for IBM’s DB
Page 296:
Chapter 4 128 You can add more than
Page 300:
Chapter 4 Try It Out Adding a CHECK
Page 304:
Chapter 4 Obviously, if the table i
Page 308:
Chapter 4 134 Drop the MoreHolidayB
Page 312:
Chapter 4 136 If you want to return
Page 316:
Chapter 4 If you’re using IBM DB2
Page 320:
Chapter 4 140 index helps speed up
Page 324:
Chapter 4 142 The results you get m
Page 328:
Chapter 4 144 The results of the qu
Page 332:
Chapter 4 146 Remember, IBM DB2 doe
Page 336:
Chapter 4 148 UPDATE Films SET Film
Page 340:
Chapter 4 150 Finally, you do the s
Page 344:
Chapter 4 152 SELECT * FROM MemberD
Page 348:
Chapter 4 ❑ Choose meaningful nam
Page 354:
5 Manipulating Data In Chapter 3, y
Page 358:
The results of this query are as fo
Page 362:
You can raise a number to any power
Page 366:
To demonstrate the sort of results
Page 370:
The CEILING() Function The CEILING(
Page 374:
ased on the digits after the decima
Page 378:
The SUBSTRING() function works at t
Page 382:
LastName UPPER(LastName) LOWER(Last
Page 386:
The LENGTH() function takes just on
Page 390:
LastName LOWER(SUBSTRING(LastName,1
Page 394:
FirstName DIFFERENCE(FirstName, ‘
Page 398:
Converting Different Data Types Thi
Page 402:
CREATE Table MyTable(FirstColumn in
Page 406:
The COALESCE() Function The COALESC
Page 410:
Ideally, this first argument is the
Page 414:
LocationId Street City State 1 Main
Page 418:
6 Grouping and Aggregating Data So
Page 422:
Running the query, complete with a
Page 426:
MemberId Street City State 11 Newis
Page 430:
Executing the SQL returns seven dis
Page 434:
For example, the following code add
Page 438:
Running the query gives the answer
Page 442:
SELECT MAX(LastName), MIN(LastName)
Page 446:
immediately after the GROUP BY stat
Page 450:
Executing the final SQL provides th
Page 456:
Chapter 7 The INNER JOIN links the
Page 460:
Chapter 7 FilmName FirstName LastNa
Page 464:
Chapter 7 212 As mentioned, that wo
Page 468:
Chapter 7 Category Street Romance T
Page 472:
Chapter 7 216 MD1.First MD1.Last MD
Page 476:
Chapter 7 SELECT MD1.MemberId, MD1.
Page 480:
Chapter 7 220 SELECT Category, Film
Page 484:
Chapter 7 222 Location.Street Membe
Page 488:
Chapter 7 224 Category MemberId War
Page 492:
Chapter 7 Look at the results that
Page 496:
Chapter 7 228 The Maltese Poodle 8
Page 500:
Chapter 7 230 9 10 11 12 13 14 15 1
Page 504:
Chapter 7 232 On Golden Puddle 1967
Page 510:
8 Queries within Queries This chapt
Page 514:
There are no films with a value in
Page 518:
The error wording depends on the da
Page 522:
Now execute the query. You receive
Page 526:
The query provides the following re
Page 530:
If you execute this query, you can
Page 534:
To obtain the same results as you w
Page 538:
MemberId 1 10 14 6 5 8 7 11 15 4 13
Page 542:
Now NOT EXISTS returns true, and as
Page 546:
This is the same as the query just
Page 550:
clause specifying that the film’s
Page 554:
4. Next, quickly double-check a few
Page 558:
Now that you’ve confirmed that th
Page 562:
Summary Queries within Queries This
Page 568:
Chapter 9 264 Figure 9-1 The SQL ne
Page 572: Chapter 9 266 INSERT INTO OrderItem
Page 576: Chapter 9 268 VALUES (5,7, 2,’200
Page 580: Chapter 9 Now that you’ve added t
Page 584: Chapter 9 272 FirstName LastName Mo
Page 588: Chapter 9 274 DVDPrice column is in
Page 592: Chapter 9 SalesPersonId FirstName L
Page 596: Chapter 9 278 SalesPersonId MemberI
Page 600: Chapter 9 280 SalesPersonId MemberI
Page 604: Chapter 9 282 MemberDetails.FirstNa
Page 608: Chapter 9 284 The query would work
Page 612: Chapter 9 Exercises 286 Assume that
Page 616: Chapter 10 Now that you know what v
Page 620: Chapter 10 Types of Views Given tha
Page 626: For example, you might want a list
Page 630: However, if you take the case of Me
Page 634: However, someone writes a query tha
Page 638: Summary As you learned, views are l
Page 644: Chapter 11 The information that fol
Page 648: Chapter 11 This SQL adds formats (d
Page 652: Chapter 11 TRANSACTION statement is
Page 656: Chapter 11 Additionally, if a DBMS
Page 660: Chapter 11 ROLLBACK TRANSACTION 310
Page 664: Chapter 11 Transaction Logs 312 How
Page 668: Chapter 11 Database There are perfe
Page 672:
Chapter 11 In order to find and fix
Page 676:
Chapter 11 When discussing locking,
Page 680:
Chapter 11 Usually, the default iso
Page 684:
Chapter 11 From Sue’s perspective
Page 688:
Chapter 11 5. At this point, you ne
Page 694:
12 SQL Security In today’s world,
Page 698:
Setting up security begins with cre
Page 702:
ALTER USER username options ALTER U
Page 706:
In Figure 12-3, three different gro
Page 710:
How It Works After you run this sta
Page 714:
check constraints can be used in a
Page 718:
You could then give SELECT privileg
Page 722:
Limitations on Views Views are by t
Page 726:
GRANT SELECT (NAME, SSN, SALARY) ON
Page 730:
Betsey also grants privileges to Ji
Page 734:
The CASCADE option tells the DBMS t
Page 738:
13 Database Tuning SQL is a languag
Page 742:
Perhaps this doesn’t sound remote
Page 746:
When an application asks for data f
Page 750:
The point of all the discussion of
Page 754:
How Do You Do It? And herein lies t
Page 758:
The slots are often implemented as
Page 762:
On the other hand, an index on a tr
Page 766:
Tuning Tips The following list cont
Page 770:
Database Tuning Exercises 1. Create
Page 776:
Appendix A Exercise 2 Solution 368
Page 780:
Appendix A ( 8, ‘Jack’, ‘John
Page 784:
Appendix A ZipCode, Email, DateOfJo
Page 788:
Appendix A Exercise 3 Solution Firs
Page 792:
Appendix A 376 Figure A-1 ISBN is a
Page 796:
Appendix A Chapter 5 Exercise 1 Sol
Page 800:
Appendix A 380 You might receive sl
Page 804:
Appendix A 382 You should use the f
Page 808:
Appendix A Your answer may differ,
Page 812:
Appendix A WHERE (SELECT COUNT(*) f
Page 816:
Appendix A Exercise 2 Solution CREA
Page 820:
Appendix A Chapter 13 Exercise 1 So
Page 824:
Appendix B 392 Click the database i
Page 828:
Appendix B 394 Click Install to beg
Page 832:
Appendix B 396 Select the Detailed
Page 836:
Appendix B 398 Leave it at the defa
Page 840:
Appendix B 400 Having entered your
Page 844:
Appendix B 402 Figure B-20 The inst
Page 848:
Appendix B 404 At the very top of t
Page 852:
Appendix B 406 Having done that, ma
Page 856:
Appendix B 408 Figure B-30 MyTable
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,
Page 908:
Appendix B 434 Click Next to procee
Page 912:
Appendix B 436 Figure B-72 The huge
Page 916:
Appendix B 438 Figure B-74 Notice t
Page 920:
Appendix B 440 Figure B-76 The Obje
Page 924:
Appendix B 442 Figure B-78 Chapter
Page 928:
Appendix B You don’t need MyTable
Page 932:
Appendix B 446 Figure B-82 To begin
Page 936:
Appendix B Using Oracle’s SQL*Plu
Page 940:
Appendix B 450 Figure B-87 Another
Page 944:
Appendix C Category Table The follo
Page 948:
Appendix C 454 ( 3, ‘Sandra’,
Page 952:
Appendix C 456 ZipCode, Email, Date
Page 956:
Appendix C DateOfJoining ) VALUES (
Page 960:
Appendix C 460 VALUES ( 1, 3 ); INS
Page 964:
Appendix C VALUES ( 5, 3 ); INSERT
Page 968:
Appendix C 464 3 ); INSERT INTO Fil
Page 972:
Appendix C 5, 6 ); INSERT INTO Film
Page 976:
Appendix C 468 5 ); INSERT INTO Att
Page 980:
Appendix C Oracle 470 To save some
Page 984:
Appendix C 472 LocationId, MeetingD
Page 990:
Symbols + (addition operator), 82,
Page 994:
BEGIN TRANSACTION statement, 306, 3
Page 998:
SERIALIZABLE statement, 318 SET TRA
Page 1002:
data types brackets, 25 categories,
Page 1006:
Oracle concatenation, 85-88 configu
Page 1010:
error messages debugging, 26 subque
Page 1014:
concatenation, 85-88 data type comp
Page 1018:
primary keys database creation exam
Page 1022:
concurrent connection selection, 39
Page 1026:
passwords group access, 333 IBM ins
Page 1030:
ROLLBACK statement, 307-308 ROLLBAC
Page 1034:
REPEATABLE READ, 319 REVOKE, 344-34
Page 1038:
telephone numbers, data type select
Page 1042:
historical, data selection, 90-94 N
show all

Beginning SQL

Create successful ePaper yourself

Delete template?

Save as template?