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What subschema expresses ?
A subschema expresses the external view. (External schemas are called also called as subschemas)
What is the need of a log in a DBMS? Briefly describe the various types of records that are normally present in a log. Ans: The system log, which is generally writt
Illustrate how you can use QBE to perform logical AND and OR operation
er diagram of sport
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
Illustrate the statement 'Projection operation distributes over the union operation'. Give an example. Ans: Π L (E 1 ∪ E 2 ) = (Π L (E 1 )) ∪ (Π L (E 2 )) This says th
You are working for the ABC Telecom and are given some customer records for data mining. You are asked to discover, from the data, patterns that characterize low-, medium- and high
What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.
Which method of access uses key transformation? A Hash method of access uses key transformation.
does tables are called relations
Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):
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