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Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
what is Mapping Constraints? with examples
What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within
A field-groups statement or an insert statement reverses storage space and transfers values. False.
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
3NF Normal Form A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true X is a Super-key of R. A is a prime attribute of R
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
What is meant by the degree of relationship set? The degree of relationship type is the number of participating entity types.
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