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Discuss the count function?
The COUNT function used returns the number of tuples or values fixed in a query.
The count function comprises two types of syntax: (1) COUNT (*) - returns the number of rows in the result query, (2) COUNT ([DISTINCT] ) - in this means, the NULL values are discarded and if employed then the duplicates are as well discarded in the count.
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Explain heap file with advantages? Heap File is an unordered set or a group of records, stored on a set of pages. This class gives basic support for inserting, updating, select
What is NULL? Simply NULL means not in value.
what is lossless & dependency preserving decomposition ?
Q. State the Technique for converting a state diagram to code. i) Identify the major control path. Starting with first state, find the path from diagram that corresponds
1 NF Normal Form The domain of attribute must add only atomic (simple, indivisible) values First normal form (Minimal Form or 1NF) is a normal form need in database normalizat
What is the use of integrity constraints? Integrity constraints make sure that changes made to the database by authorized users do not result in a loss of data consistency. The
Modify a sequence: ALTER SEQUENCE SEQSS INCREMENT 2 MAXVALUE 3000; Removing a sequence: DROP SEQUENCE SEQSS;
What is called block-level striping? Block level striping stripes blocks across many disks. It treats the array of disks as a large disk, and provides blocks logical numbers
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