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What is NULL? Give an example to described testing for NULL in SQL?
The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a relational table. Consider there is a relation:
Person(id, name, address, phone)Now to search ids and names of person who do not have a phone is: Select id, name from Person where phone is null
Which method of access uses key transformation? A Hash method of access uses key transformation.
Describe in brief about DBMS ?
create an er diagram for production management in film industry
Horizontal Fragmentation- Horizontal fragmentation groups together the tuples in a relation that are collectively used by the main transactions. A horizontal fragment is produced b
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
Critically explained the benefits and limitations of different database technologies with proper examples
#what is cursor its uses ? Explain it
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
what is the importance of back up files
how many hourse have been spent on a certain project
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