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In tuple relational calculus P1→ P2 is equivalent to ?
A In tuple relational calculus P1→ P2 is equivalent to ¬P1 V P2. (The logical implication expression A B, meaning if A then B,is equivalent to ¬A V B)
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
client server architeutre
Now that she understands more about the benefits of databases, the play-scheme manager would like to extend the play-scheme database to include data for schools and instructors as
What are partial, alternate,, artificial, compound and natural key? Partial Key: It is a set of attributes that can uniquely recognize weak entities and that are related to s
Why a report generator is used ? Report generator is used for print files on paper.
Table Handling In RDBMS more than one table can be tackled at a time by using join operation. Join operation is a relational operation that causes 2 tables with a common domai
Describe in brief about the Sequence Diagrams Sequence diagrams are interaction diagrams which emphasize time ordering of messages. In UML, it is shown as a table which shows
What are the advantages of having an index structure? Ans: The index structures commonly provide secondary access paths, which offer alternative ways of accessing the reco
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can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
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