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supported trigger?

BEFORE

DURING

AFTER

INSTEAD OF

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Which one of the following deletes all the entries but keeps the structure of the relation.

Delete from r where P

Delete from instructor where dept name

Delete from instructor where salary between 13000 and 15000

Delete from instructor

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Which of the following is used as the embedded SQL in COBOL?

EXEC SQL

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The above command

Deletes a particular tuple from the relation

Deletes the relation

Clears all entries from the relation

All of the mentioned

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Why does this statement cause an error when QUANTITY values are null?

The expression attempts to divide by a null value

The data types in the conversion function are incompatible

The character string none should be enclosed in single quotes

A null value used in an expression cannot be converted to an actual value

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The predicate in a where clause can involve Boolean operations such as and. The result of true and unknown is_______ false and unknown is _____ while unknown and unknown is _____

Unknown, unknown, false

True, false, unknown

True, unknown, unknown

Unknown, false, unknown

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category More Database Management System Topics

Miscellaneous or General

Relational Algebra

Database Systems

Data Models

The Relational Database Model

Entity Relationship (ER) Modeling

Advanced Data Modeling

Normalization

Structured Query Language (SQL)

Advanced SQL

Database Design

Transaction and Concurrency

Data Warehouses

Database Administration

Mixed

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