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Define Query by Example QBE is a query language relies upon domain calculus and has two dimensional syntax. The queries are written in the horizontal and vertical dimensions of
why are older data models are being replaced by new data models
growing phase and shrinking phase are disjoint, why ?
#question benefits and limitations of data models..
What is an ER diagram? Why is it used in Database management system (DBMS)?
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
What are called journaling file systems? File systems that support log disks are known as journaling file systems.
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
Discuss The difference between drop table R and delete from R. DROP TABLE command deletes all the records with the table definition. This command will automatically committed
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