February 2005
Beginner to intermediate
540 pages
14h 9m
English
Content preview from Fuzzy Modeling and Genetic Algorithms for Data Mining and Exploration
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6.3 Structured Query Language Fundamentals
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159
ProjectId
Projects
database
Projects
EmployeeId
Staffing
<Temp>
ProjMgr
Budget
Duration
StaffLvl
NumEvents
RevCount
Priority
JobTitle
Rate
Department
ProjMgr
Budget
Department
Join
Budget
>80
Department
=“Engr”
Figure 6.5 Explicit joins between project and staffing.
6.3 Structured Query Language Fundamentals
SQL evolved from the work of Edgar Codd and Chris Date as a standard
and uniform method of creating, accessing, and manipulating relational
databases. In SQL, the user tells the computer what columns they want,
which tables are involved, how the tables should be joined, and which
rows from the tables will participate in the ...
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