An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 5 pptx

... 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

... ( BB CARTESIAN, EE CARTESIAN ) NOT FINAL ; 5 .17 See Answer 4 .1 and Answer 5 .16 . 5 .18 No answer provided. 5 .19 See Section 5. 7, subsection "Structured Types." 5. 20 No answer ... suppliers-and-parts database: CREATE TYPE S# AS CHAR (5) FINAL ; CREATE TYPE P# AS CHAR(6) FINAL ; CREATE TYPE J# AS CHAR(4) FINAL ; CREATE TYPE NAME AS CHAR(20) FINAL ; CR...

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 ... SPJ, DELETE on S, DELETE on SPJ, UPDATE on S.S#, UPDATE on S.CITY, UPDATE on SPJ.S#, UPDATE on SPJ.QTY p. UPDATE on SPJ.QTY q. UPDATE on S.CITY 9 .5 a. Accepted b. Re...

Ngày tải lên: 06/08/2014, 01:21

... 14 . Semantic Modeling Part IV : Transaction Management 15 . Recovery 16 . Concurrency Copyright (c) 2003 C. J. Date page fm .5 • Read Chapters 3 and 4 very carefully. • 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 ... retrieve all required stored record occurrences; next, construct the required conceptual record occurrences; finally, construct the Copyright (c) 2003 C. J. Date page 3 .5 ( EMP...

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

... 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 (...

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 ( ... SPJX .J# = JX .J# ) 8 .13 .24 SPJX.P# WHERE EXISTS SX EXISTS JX ( SX.CITY = JX.CITY AND SPJX.S# = SX.S# AND SPJX .J# = JX .J# ) 8 .13 . 25 SPJX .J# WHERE EXISTS SX EXISTS...

Ngày tải lên: 06/08/2014, 01:21

... 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 SPJ WHERE SPJ.P# ... 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

... such as those discussed earlier in the chapter don't occur with this relvar. Exercise: Check this claim." Answer: It's easy to see that Copyright (c) 2003 C. J. Date page 11 .5 ... answer provided. Candidate keys: L, DPC, and DPT. 11 .14 Abbreviating NAME, STREET, CITY, STATE, and ZIP * to N, R, C, T, and Z, respectively, we have: N → RCT RCT → Z Z → CT...

Ngày tải lên: 06/08/2014, 01:21