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 ... 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

... 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 W...

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

... don't need to be exhaustively discussed). 11 .2 Basic Definitions / 11 .3 Trivial and Nontrivial FDs / 11 .4 Closure of a Set of FDs / 11 .5 Closure of a Set of Attributes / 11 .6 Irreducible Sets ... 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...

Ngày tải lên: 06/08/2014, 01:21

... Copyright (c) 2003 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 No answer provided. 21. 8 No answer ... Richard T. Snodgrass: Developing Time-Oriented Database Applications in SQL. San Francisco, Calif.: Morgan Kaufmann (2000). Answers to Exercises 23 .1 A time qu...

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 ... Boston, Mass. 0 211 6, care of Katherine Harutunian ( 61 7 /84 8-7 518 ). Thank you for your interest. Healdsburg, California C. J. Date 2003 *** End of Preface *...

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

... in connection with these operators can be found in the article "A Sweet Disorder," already mentioned in Chapters 4 and 6 of this manual. Copyright (c) 2003 C. J. Date page 6 .12 ... │ │ │ 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

... 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 JX...

Ngày tải lên: 06/08/2014, 01:21