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Explain the structure of well formed formulae in relational calculus.
Ans: a. An atom is a formula
b. If P1 is a formula, after that so are ¬P1 and (P1)
c. If P1 and P2 are formulae, after that so are P1 V P2, P1 ^ P2, P1 → P2
d. If P1(s) is a formula containing a free variable s and r is a relation after that
∃ s ε r (P1(s) ) and ∀ s ε r (P1(s)) are also formulae
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OBJECTIVES After going through this unit you should be capable to: Explain the File Based system and its limitations; Explain the structure of DBMS; Explain the
wh
What is the way a particular application views the data from the database that the application uses? Sub schema is the way a particular application views the data from the data
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why older data models are being replaced by new data models.
How is the database organised in Oracle? Database organized within Oracle in terms of table and table holds attributes and values. A database consists of one or more logical
HOW TO SOLVE THE LP Problems by simplex method?z=x1+-3x2+2x3
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