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Whst is logical schema ?
Logical schema is the entire database.
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
List any two disadvantages of a database system ? The disadvantages of database system are: • Database systems are difficult, complex, and time-consuming to design. • Substanti
what is meant semantic query optimization? how does it differ from other query optimization techniques?
wh
Differentiate between horizontal & mixed horizontal fragmentation?
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
Economics: It is now usually accepted that it costs less to make a system of smaller computers with the equivalent power of a one large computer. It is more cost-effective to get s
Distributed query and transaction processing a. Construct a query around any one of the functional divisions you made in 4a such that if executed in the distributed design of 4
example of bank
What is a view in SQL? When can views be updated? A view is a virtual table which consists of columns from one or more tables. Through it is same to a table; it is stored in
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