An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 10 pps

... 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 Al 1 - 1 - y Ay 0 - 7 - Bailey, ... Discuss data independence Copyright (c) 20 03 C. J. Date page D.4 yet be no records that actually hash to h...

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... 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 and PHON...

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... 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...

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... 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. Da...

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... B 2. AB → C 3. D → AC 4. D → E Now, 3 can be replaced by: 3. D → A and D → C Next, 1 and 2 together imply that 2 can be replaced by: 2. A → C But now we have D → A and A → C, ... can change the status for London from 20 to 30 by changing it once and for all in the relevant CS tuple. 12. 3 1NF, 2NF, 3NF Mostly self-explanatory. Another nice intuitive c...

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... 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,...

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... 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 * 1 * 2 *...

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... 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 "COLORED_CIRCLE ... 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 ver...

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... 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 ... Decision Support Self-explanatory. Observe in particular: Copyright (c) 20 03 C. J. Date page 22 .8 22 . 12 No answer provided. *** End of Chapter 22...

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... 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