An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 1 pps

... 14 . Semantic Modeling Part IV : Transaction Management 15 . Recovery 16 . Concurrency Copyright (c) 2003 C. J. Date page fm.5 ã Read Chapters 3 and 4 very carefully. ã Read Chapters ... C. J. Date Copyright (c) 2003 C. J. Date page fm.4 Part V : Further Topics 17 . Security 18 . Optimization 19 . Missing Information 20. Type Inheritance...

Ngày tải lên: 06/08/2014, 01:21

... deliberate, and so is the lack of reference to the ACID acronym.) Superficial!──this is just an introduction. Forward references to Chapters 15 and 16 . 3.9 The Suppliers-and-Parts DB ... is added to the CELLAR table. Copyright (c) 20 03 C. J. Date page 2. 3 both source and object form, in the dictionary). A comprehensive dictionary will also include cross-...

Ngày tải lên: 06/08/2014, 01:21

... CS_SC ; EXEC SQL OPEN CJ ; DO for all J rows accessible via CJ ; EXEC SQL FETCH CJ INTO :CJ _J# , :CJ_JN, :CJ_JC ; print CJ _J# , CJ_JN, CJ_JC ; END DO ; EXEC SQL CLOSE CJ ; END DO ; EXEC SQL ... SELECT S.S#, S.SNAME, S.STATUS, S.CITY FROM S ORDER BY S# ; EXEC SQL DECLARE CJ CURSOR FOR SELECT J. J#, J. JNAME, J. CITY FROM J WHERE J. J# IN ( SELECT SPJ .J# FROM SPJ...

Ngày tải lên: 06/08/2014, 01:21

... covered) Read-only vs. Update Operators The distinction between read-only and update operators──another logical difference!──becomes particularly important when we get to inheritance ... fact a scalar update operator specifically, and might object, correctly, that scalar update operators aren't part of the relational model. The discussion of such operators in this chapte...

Ngày tải lên: 06/08/2014, 01:21

... 13 .2 MVDs and 4NF Mostly self-explanatory. Possible points for the instructor to note: Copyright (c) 20 03 C. J. Date page 12 . 19 12 . 7 NADDR is in 2NF but not 3NF (and hence not BCNF). ... or even just to BCNF, can unfortunately be in conflict.) Copyright (c) 20 03 C. J. Date page 12 . 15 is at all times equal to a projection of the join of EMP3 an...

Ngày tải lên: 06/08/2014, 01:21

... SPJ { S#, P# } JOIN SPJ { P#, J# } JOIN SPJ { J# , S# } ; Calculus version: CONSTRAINT SPJ_JD SPJ = { SPJX.S#, SPJY.P#, SPJZ .J# } WHERE SPJX.P# = SPJY.P# AND SPJY .J# = SPJZ .J# AND SPJZ.S# ... CTXD1.COURSE = CTXD2.COURSE AND CTXD1.TEACHER = CTXD2.TEACHER AND CTXD1.TEXT = CTXD2.TEXT ) AND ( NOT EXISTS ( SELECT DISTINCT COURSE, TEACHER, TEXT FROM ( ( SELECT DISTINCT COURSE,...

Ngày tải lên: 06/08/2014, 01:21

... T1-T3-T2 : A = 2 T2-T1-T3 : A = 1 T2-T3-T1 : A = 2 Copyright (c) 20 03 C. J. Date page V .2 *** End of Introduction to Part V *** Copyright (c) 20 03 C. J. Date page 16.10 Copyright ... U1, U2, U3, again not necessarily in that order.) Ri-Rj-Rk-Up-Uq-Ur : 3 * 2 * 1 * 3 * 2 * 1 = 36 possibilities Ri-Rj-Up-Rk-Uq-Ur : 3 * 2 * 2 *...

Ngày tải lên: 06/08/2014, 01:21

... into internal form 2. Convert to canonical form 3. Choose candidate low-level procedures 4. Generate query plans and choose the cheapest In practice, Stage 1 effectively becomes "convert ... different access paths to be deployed (physical data independence). Commercial optimizers do a Copyright (c) 20 03 C. J. Date page 18 .2 reasonably good job on the second aspect...

Ngày tải lên: 06/08/2014, 01:21

... operators specifically. OPERATOR ROTATE ( T RECTANGLE ) UPDATES T VERSION ROTATE_RECTANGLE ; Copyright (c) 20 03 C. J. Date page 21 .5 Recovery control: Explain two-phase commit very carefully──the ... are clearly more colored circles than there are circles. And colored circles can't be obtained from circles via S by C, either. Note the remark to the effect that &q...

Ngày tải lên: 06/08/2014, 01:21

... the introductory remark: (Begin quote) The "views" mentioned in the titles of references [22 . 3 -2 2. 5], [22 .10], [22 . 12] , [22 . 16] , [22 .25 ], [22 .28 ], [22 .30], and [22 .35] are not ... Copyright (c) 20 03 C. J. Date page 21 .7 21 .3 See Section 21 .2. 21 .4 See Section 21 .4. 21 .5 See Section 21 .4. 21 .6 No answer provided. 21 .7...

Ngày tải lên: 06/08/2014, 01:21

... 24 .6 .23 RES ( c1 , c2 ) *═ SPJ ( s, p, j, q ) AND S ( s, sn, st, c1 ) AND J ( j, jn, c2 ) ? *═ RES ( c1 , c2 ) 24 .6 .24 RES ( p ) *═ SPJ ( s, p, j, q ) AND S ( s, sn, st, c ) AND J ( j, ... jn, c ) ? *═ RES ( p ) 24 .6 .25 Can't be done without negation. 24 .6 .26 RES ( p1, p2 ) *═ SPJ ( s, p1, j1 , q1 ) AND SPJ ( s, p2, j2 , q2 ) ? *═ RES ( p1, p2...

Ngày tải lên: 06/08/2014, 01:21

... that Copyright (c) 20 03 C. J. Date page 25 .14 hierarchies at all, consisting of an "SP" class, a "PJ" class, and a "JS" class. 25 . 12 The performance factors ... and G by C are supported, type constraints are supported too, and noncircular circles and the like can't occur. (And run-time type errors specifically can occur only in the...

Ngày tải lên: 06/08/2014, 01:21

... isn't well-formed if it involves (say) a left -to- right ordering to its attributes; if it involves a left -to- Copyright (c) 20 03 C. J. Date page 27 .20 explanation). In XML Schema, by contrast, ... <ProjectTuple> <JNUM> ;J7 </JNUM> <JNAME>Tape</JNAME> <CITY>London</CITY> </ProjectTuple> Copyright (c) 20 03 C. J....

Ngày tải lên: 06/08/2014, 01:21

... C. J. Date page D.6 D.11 Values recorded in index Expanded form 0 - 2 - Ab Ab 1 - 3 - cke Acke 3 - 1 - r Ackr 1 - 7 - dams,T+ Adams,T+ 7 - 1 - R Adams,TR 5 - 1 - o Adamso 1 - 1 - l ... Discuss data independence Copyright (c) 20 03 C. J. Date page D.4 yet be no records that actually hash to h2 as such. In oth...

Ngày tải lên: 06/08/2014, 01:21

Ngày tải lên: 06/08/2014, 01:21