Oracle Certification Questions

Q:

What is the maximum number of triggers, can apply to a single table?

A) 8 B) 10
C) 12 D) 14
 
Answer & Explanation Answer: C) 12

Explanation:

Maximim number of triggers that can be applied to a single table is 12

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Q:

Breaking of relationships is allowed once referential integrity on a database is enforced

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

Breaking of relationships is prevented once referential integrity on a database is enforced

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Q:

A column defined as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Because a table can have only one primary key

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Q:

What is the default return value of a function?

A) int B) char
C) string D) None of the above
 
Answer & Explanation Answer: A) int

Explanation:

The default return value from a function is int. In other words, unless explicitly specified the default return value by compiler would be integer value from function.

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Q:

Which among the following keys are used to identify each row of the table uniquely?

A) Primary key B) Unique key
C) Partial key D) None of the above
 
Answer & Explanation Answer: A) Primary key

Explanation:

Primary key helps us to identify a row uniquely in a relation

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Q:

What is the difference between oracle,sql and sql server?

Answer

  • Oracle is based on RDBMS.

  • SQL is Structured Query Language.

  • SQL Server is another tool for RDBMS provided by MicroSoft


 

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Q:

Multiple users can share a local temporary table

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

Multiple users can't share a local temporary table

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Q:

Can’t update primary table’s primary key if row being modified has related rows in secondary table once referential integrity is enforced

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:
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