An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 3 pdf

... 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

... decomposed (e.g., into decimal digits, or into integer and fractional parts) in suitable circumstances; so is a number atomic? What about bit and character strings, which are obviously decomposable? ... │ │ │ C │ │ │ a1 │ b1 │ c2 │ │ │ ├════┤ │ ├════┤ │ │ a1 │ b2 │ c1 │ │ │ │ b1 │ │ │ c1 │ │ │ a1 │ b2 │ c2 │ │ │ │ b2 │ │ │ c2 │ │ │ a2 │ b1 │ c1 │ │ │ └────┘ │ └────┘ │ │ a2 │ b1...

Ngày tải lên: 06/08/2014, 01:21

... 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 ... constraints, which is why Chapters 7 and 8 precede Chapter 9. Copyright (c) 2003 C. J. Date page 7 .15 AND JCITY =/ SCITY ) { S#, P#, J# } 7. 21 P SEMIJOIN ( SPJ SEMIJOIN ( S...

Ngày tải lên: 06/08/2014, 01:21

... S#:SX, CITY:CITYX ) AND J ( J# :JY, CITY:CITYY ) AND SPJ ( S#:SX, J# :JY ) ) 8 .15 .24 PX WHERE EXISTS SX EXISTS JX EXISTS CITYX ( S ( S#:SX, CITY:CITYX ) AND J ( J# :JX, CITY:CITYX ) AND SPJ ( ... S.S#, P.P#, J. J# FROM S, P, J WHERE S.CITY = P.CITY AND P.CITY = J. CITY ; 8 .14 .19 SELECT S.S#, P.P#, J. J# FROM S, P, J Copyright (c) 2003 C. J. Date page 8 ....

Ngày tải lên: 06/08/2014, 01:21

... RESTRICT specification) f. Accepted (project J4 and all shipments for project J4 are deleted) g. Accepted h. Rejected (candidate key uniqueness violation) Copyright (c) 2003 C. J. Date page ... EXISTS ( SELECT * FROM J AS JX WHERE EXISTS ( SELECT * FROM J AS JY WHERE ( JX .J# <> JY .J# AND JX.CITY = JY.CITY ) ) ) ) ; e. CREATE ASSERTION SQL_E CHECK ( ( SELEC...

Ngày tải lên: 06/08/2014, 01:21

... 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...

Ngày tải lên: 06/08/2014, 01:21

... more of an art than a science. It's true that there are some scientific principles that can be brought to bear on the problem, and those principles are the subject of Chapters 1 1- 1 3; unfortunately, ... Introduction to Part III *** Copyright (c) 2003 C. J. Date page 11 .4 is constrained to contain at most one tuple (for further discussion, see the answ...

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 *...

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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...

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