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Define weak and strong entity sets? Weak entity set: entity set that do not have key attribute of their own are known as weak entity sets. Strong entity set: Entity set that
What are the advantages of relational data model? Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
Find the names of all Albums that have more than 30 tracks. Result: (name: varchar(255))
Let us now make the E-R diagram for the student database as per the explanation given in the previous section. We can also states the overall logical structure of a database usi
Two Phase Locking (2PL) The two-phase locking protocol having of two phases: Phase 1 : The lock acquisition phase : If a transaction T needs to read an object, it wants to
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
What is the difference between serial and sequential files? How searching is applied on both? Ans: A serial file is one where the records have been stored in the order where
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