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Views in relational algebra:
1. Basic expression contains either
a) A relation in the database.
b) A constant relation.
2. General expressions are madde out of smaller sub expressions using
a) σp(E1) select (p a predicate)
b) ∏s(E1) project (s a list of attributes)
c) Px(E1)rename (x a relation name)
d) E1∪E2 union
e) E1- E2 set difference
f) E1x x E2 cartesian product
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Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need
explain normalisation
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The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
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