Applied Mathematics for Database Professionals phần 9 pdf
Applied Mathematics for Database Professionals phần 9 pdf
... Report RJ 599 , 196 9.
Codd, E. F.
The Relational Model For Database Management,Version 2. Reading, MA: Addison-
Wesley, 199 0.
Recommended Reading on Relational Database Management
Date, C. J. Database ... ■ FORMAL DEFINITION OF EXAMPLE DATABASE3 14
7451AppA.qxd 5/15/07 9: 45 AM Page 314
Formal Definition of Example
Database
In this appendix, we deliver the formal specification...
Applied Mathematics for Database Professionals phần 1 pot
... http://www.springeronline.com.
For information on translations, please contact Apress directly at 2855 Telegraph Avenue, Suite 600,
Berkeley, CA 94 705. Phone 510-5 49- 593 0, fax 510-5 49- 593 9, e-mail
info@apress.com, ... Russell and Alfred North Whitehead (1861– 194 7),
David Hilbert (1862– 194 3), John von Neumann ( 190 3– 195 7), Kurt Gödel ( 190 6– 197 8), and
Alfred Tarski ( 190 2...
Applied Mathematics for Database Professionals phần 2 ppt
... and therefore a source of confusion.
The section “Normal Forms” discusses normal forms in logic—not to be confused with
normal forms of data (defined for database design purposes). Normal forms ... following two normal forms for predicates:
•
Conjunctive normal form is a predicate rewritten in the format of an iterated AND.
•
Disjunctive normal form is a predicate rewritten in the forma...
Applied Mathematics for Database Professionals phần 3 docx
... shorthand name for a given
database universe (just symbols) for conven-
ience of reference in the text.
Database State
Database state is a formal term. It is a mathematical construct used to formally ... text.
Database
Database is an informal term for the actual (business) data that is stored in a computer in a
structured way (that is, conforming to the database design). Abstr...
Applied Mathematics for Database Professionals phần 4 docx
... (partno; [1 99 9])
,(name; varchar(12))
,(instock; [0 99 ])
,(price; [1 500]) }
CHAPTER 5 ■ TABLES AND DATABASE STATES 97
7451CH05.qxd 5/4/07 3:57 PM Page 97
Given table T11 and T6, you can formally ... chr_EMP
chr_EMP := { (empno; [100 99 9])
,(ename; varchar(20))
,(job; {'MANAGER','CLERK','TRAINER'} )
,(sal; [2000 90 00])
,(deptno; [10 99 ]) }
For...
Applied Mathematics for Database Professionals phần 5 pps
... expression denotes set
[1000 99 99] .
The definition of characterization
chr_EMP tells us the following:
•
EMPNO values are positive integers within the range 1000 to 99 99.
•
ENAME v
alues ar
e v
ar
iable ... limit
regarding database professionals, then there cannot be a result with an average score of
A for
database professionals (r
egardless of the course), and if ther
e is a...
Applied Mathematics for Database Professionals phần 6 pptx
... set of database states called the
database universe.
It holds the admissible database states for the database being specified. You can con-
struct a database universe by first defining a
database ... result by specifying database predicates. These
database predicates are called
database constraints.
• This formal model is
your—the database professional’s—reference of th...
Applied Mathematics for Database Professionals phần 7 pot
... of a database; they enable you to extract infor-
mation from a database that is relevant for you.
• You can formally represent a query as a function over a database universe. For every
database ... database:
tcrs1 := { (CODE;'AM4DP')
, (DESC;&apos ;Applied Mathematics for Database Professionals& apos;)
, (CAT;'DSG')
, (DUR;5) }
For your convenience,...
Applied Mathematics for Database Professionals phần 8 doc
... Attribute Constraints for SREP Table Structure
alter table SREP add constraint srp_chk_empno check (empno > 99 9);
alter table SREP add constraint srp_chk_targ check (target
> 99 99) ;
alter table ... Attribute Constraints for MEMP Table Structure
alter table MEMP add constraint mmp_chk_empno check (empno > 99 9);
alter table MEMP add constraint mmp_chk_mgr check (mgr
>...
Applied Mathematics for Database Professionals phần 10 doc
... 143
defined, 93
queries and, 199 –201
specifying formally, 98
top-down view of, 141
transactions and, 221–233
database universe, 36, 77, 1 39, 306
defined, 92
queries and, 199 –216
sample database design and, ... 1 09
average operator (AVG), 112
binary relations, 69
cardinality of sets, 29
Cartesian product, 39
compatible functions, 77
database, 93
database design, 92
data...
Từ khóa:
- discrete mathematics for computer science solution manual pdf
- introducing windows 8 an overview for it professionals pdf
- introducing windows server 2012 r2 for it professionals pdf
- mathematics for computer science 2012 pdf
- introducing windows 8 an overview for it professionals pdf ebook
- advanced analytic methods in applied mathematics science and engineering pdf