What create when a primary key combined with a foreign key, Database Management System

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What will be create when a primary key if combined with a foreign key?

A primary key if combined with a foreign key it creates Parent-Child relationship between the tables that connect them.

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What is object containment? References among objects can be used to model dissimilar real-world concepts.

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Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention

What is the difference between serial and sequential files, What is the dif...

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To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;

What is a value, What is a value? A data value is used for identity. Th...

What is a value? A data value is used for identity. This form of identity is used in relational systems.eg: The primary key value of a tuple recognize the tuple.

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Explain the integrity constraints: Not Null, Unique, Primary Key with an example each. Is the combination 'Not Null, Primary Key' a valid combination. Justify. Not Null - Shou

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List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization

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