An Introduction to Database Systems 8Ed - C J Date - Solutions Manual Episode 1 Part 6 pot

... 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 be many -to- one because ... actual values involved right now? Presumably the former──but we must be clear. And then does "inherently many -to- one" mean, specifically, a foreign-key -to- matching-candidate-key join,...

... 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 → Z Z → CT An obviously ... 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) 2003 C. J. Date page 12 .6 Stress...

... 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 quantum (also known as a chronon) ... hand" is an example of uncontrolled redundancy. Redundancy is important for decision support because it can make query formulation simpler and query execution faster. Such redundancy...

... 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 *** Copyright (c) 2003 C. ... 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 21. Distributed Databases...

... 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 WHERE SPJ.S# = :CS_S# ... Copyright (c) 2003 C. J. Date page 4 .10 Java──because cursors in SQLJ are replaced by Java "iterator objects" that can be stacked in recursive calls (thanks to an anonymous reviewer...

... 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 chapter ... here, which makes a purely syntactic distinction between operator and function. To be specific, SQL uses function to mean an operator that's invoked by means of classical functional notation──or...

... 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 │ c3 │ │ ... intellectual achievements of the human race. Copyright (c) 2003 C. J. Date page 7.2 axioms or laws, such as the laws of closure, commutativity, associativity, and so on (closure is particularly...

... 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 ( SX.CITY =/ JX.CITY AND ... EXISTS JX ( SPJ ( P#:PX, J# :JX ) AND Copyright (c) 2003 C. J. Date page 8 . 16 WHERE NOT ( S.CITY = P.CITY AND P.CITY = J. CITY ) ; 8 .14 .20 SELECT S.S#, P.P#, J. J# FROM S, P, J WHERE S.CITY...