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Explain Foreign Key?
Foreign Key - Let there are two relations (tables) R and S. Any candidate key of the relation R that is referred within the relation S is known as the foreign key within the relation S and referenced key in the relation R. The relation R is also known as parent table and relation S is also known as child table.
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
MOSS VALE is a town with 15000 inhabitants. The fire department wishes to develop a system that automates the despatch of fire engines to attend fires. The ERD below describes the
Explain the database Planning Project ?
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
Different stages of DDLC ?
Explain concept of inheritance with support of suitable example. Inheritance Inheritance is one of milestone of object-oriented programming language as it allows a creati
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
what is lossless & dependency preserving decomposition ?
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
What is database Trigger? A database trigger is a PL/SQL block that can explained to automatically execute for insert, update, and delete statements against a table. The trigge
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