An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 6 pot
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 6 pot
... 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...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 6 pot
... ) JOIN SPJ JOIN
( J RENAME CITY AS JCITY ) ) { SCITY, JCITY }
7 .24 ( J JOIN SPJ JOIN S ) { P# }
7 .25 ( ( ( J RENAME CITY AS JCITY ) JOIN SPJ JOIN
( S RENAME CITY AS SCITY ) )
WHERE JCITY ... P#, J# }
7 .20 ( ( ( S RENAME CITY AS SCITY ) TIMES
( P RENAME CITY AS PCITY ) TIMES
( J RENAME CITY AS JCITY ) )
WHERE SCITY =/ PCITY
AND PCITY =/ JCITY
Copyright (c) 20 03...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 3 potx
...
T1-T2-T3 : A = 1
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 ...
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 * 1 = 24...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 1 pot
... Databases
22 . Decision Support
23 . Temporal Databases
24 . Logic-Based Databases
Part VI : Objects, Relations, and XML
25 . Object Databases
26 . Object/Relational Databases
27 . The World ... C. J. Date
Copyright (c) 20 03 C. J. Date page fm.4
Part V : Further Topics
17. Security
18. Optimization
19. Missing Information
20 . Type Inheritance
21 . Distrib...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 9 pot
... BY SPJ.S#, SPJ.P# ;
10.18.4 CREATE VIEW JC
AS SELECT J. J#, J. CITY
FROM J
WHERE J. J# IN ( SELECT SPJ .J#
FROM SPJ
WHERE SPJ.S# = S# ( 'S1' ) )
AND J. J# IN ( SELECT SPJ .J#
FROM ... have to face up to questions such as: Does
(e.g.) many -to- one mean a relationship that's inherently,
necessarily many -to- one, or does it mean one that just
happens to...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 10 pot
... 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, ... the given set such that every
FD has a singleton right side:
1. AB → C
2. C → A
3. BC → D
4. ACD → B
5. BE → C
6. CE → A
7. CE → F
Copyright (c) 20 03 C. J. Date pag...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 1 pps
...
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...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 2 pot
... 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,...
An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 2 Part 4 ppsx
... 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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