DATABASE SYSTEMS (phần 10) docx
DATABASE SYSTEMS (phần 10) docx
... Context for Using
Database Systems
Database systems
have
become a
part
of
the
information systems of many organizations.
In
the
1960s
information systems were
dominated
by file systems, but since ... THE
DATABASE
DESIGN AND
IMPLEMENTATION
PROCESS
We now focus on activities 2
and
3 of
the
database application system life cycle, which
are database design and implementation.
T...
DATABASE SYSTEMS (phần 6) docx
... success
of
rela-
tional
databases in
the
commercial world. Because it became a standard for relational
databases,
users were less
concerned
about
migrating
their
database applications from
other
types of database
systems- for
example,
network
or ... 10
b
5
FIGURE
6.13
A
database
state for
the
relations T1
and
T2.
Relational Database
Design by
ER-
and
EER-to-Relational
Mapping
We now...
DATABASE SYSTEMS (phần 23) docx
... OLAP
28.1
INTRODUCTION,
DEFINITIONS,
AND
TERMINOLOGY
In
Chapter
1 we defined database as a collection of related
data
and
a database system as a
database and database software together.
A data warehouse is also a ... of
the
software
problems-which
may involve data management, transaction
management,
and
database
recovery-have
their origins in distributed database systems.
In mob...
Tài liệu Trang bị điện II (phần 10) docx
... RTr2.2(13) =1 →
RTr2.1(9) =1, RTr2.2(5,6) =1 và
RTr2.3 (10) = 0 → điện áp U
cđ
sẽ được lấy trên Rω3 có giá trị lớn. Đồng thời
RTr2 (10) = 0 → RTr4(11) =0 → RTr4(25) = 0 → KK(25) =1 → kết quả ... = 0 → KP1(23) =1 → RTh(23) =1 → RTh(24) =1 →
KP3(24) = 1; RTr2(16) =1 → KT(16) =1; RTr2 (10) =1 → KP2 (10) =1 →
KP2(21) =1 → NC1(21) =1 → nối trục động cơ với trục mắc.
Do KT có điện nên đ...
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