... concepts (see
Chapter
24).
• KR schemes include reasoning
mechanisms
that
deduce additional facts from the
facts stored in a database.
Hence,
whereas most
current
database systems are limited
to ... relational database
and
a rela-
tional database schema. A
relational
database
schema
S is a set of relation schemas S =
(R
I
,
R
z
,
, R
m
}
and
a set of
integrity
constraints
IC....
... discussing
the
role of information systems in organizations;
database systems are looked
upon
as a
part
of information systems in large-scale
applica-
tions. We discussed
how
databases fit
within
an information ... discuss
the
role
ofdata dictionaries in database design. Rozen
and
Shasha
(1991)
and
Carlis
and
March
(19 84)
present different models for
the
problem of physical datab...
... (see
Chapter
6).
Practical Database
Design and Tuning
In this chapter, we first discuss
the
issues
that
arise in physical database design in
Section
16.1.
Then, we discuss
how
to
improve database performance through database
tuning
in
Section ... all phases of database design
and
point out
the
role of
data
dictionaries. Rozen
and
Shasha
(1991) and Carlis
and
March
(19 84)
present d...
... in a database.
Because
part
of
the
theoretical foundation for some deductive database systems is
mathematical
logic, such rules are often referred to as logic databases.
Other
types of
systems, ... in
the
application programs
that
access
the
database.
Section
24.3 will give a brief overview of spatial
and
multimedia databases. Spatial
databases provide
concepts
for databases
that
kee...
... types of distributed database systems, including federated and
multidatabase systems
and
highlights
the
problems of heterogeneity and the needs of
autonomy in federated database systems, which will ... retrieve
the
employee
25.7
Distributed Databases in
Oracle
I831
Net8
Database
server
Database
server
Net8
(c:::>c:::>c:::>
=
EMPtable
t-
,
,
Sales
,
database
CONNECT T...
... – SƯ ĐOÀN 2 – QUÂN ĐOÀN HẢI QUÂN
1
CHUYÊN ĐỀ HÀM SỐ VÀ ĐỒ THỊ
BÀI TẬP HÀM SỐ BẬC HAI (PHẦN 4)
Bài 1. Cho hàm số
2
2 3
y x x
(P).
1. Xác định tọa độ đỉnh; trục đối xứng và hướng