Oracle Subqueries, TRUNCATE TABLE, and WHERE Clause MCQs

Oracle Subqueries, TRUNCATE TABLE, and WHERE Clause MCQs: This section contains multiple-choice questions and answers on Subqueries, TRUNCATE TABLE, and WHERE Clause in Oracle.
Submitted by Anushree Goswami, on June 28, 2022

1. A subquery in Oracle is a query inside another query.

  1. Inside
  2. Outside
  3. On the edge to
  4. None

Answer: A) Inside

Explanation:

A subquery in Oracle is a query inside another query.

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2. The ____ clauses can be used to create subqueries.

  1. WHERE
  2. FROM
  3. SELECT
  4. All of the above

Answer: D) All of the above

Explanation:

The WHERE, FROM, and SELECT clauses can be used to create subqueries.

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3. To delete all records from a table, use the ____ statement in Oracle.

  1. Remove
  2. Truncate
  3. Drop
  4. None

Answer: B) Truncate

Explanation:

To delete all records from a table, use the truncate statement in Oracle.

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4. The delete statement works the same way, except that there is no ___ clause.

  1. From
  2. Where
  3. Group by
  4. Order by

Answer: B) Where

Explanation:

The delete statement works the same way, except that there is no where clause.

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5. What is the syntax of Truncate?

  1. Truncate table_name;
  2. Truncate table table_name;
  3. Table table_name;
  4. Truncate table;

Answer: B) Truncate table table_name;

Explanation:

The syntax of Truncate is:

Truncate table table_name;

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6. Filtering results in Oracle is done using the ____ clause.

  1. From
  2. Where
  3. Group by
  4. Order by

Answer: B) Where

Explanation:

Filtering results in Oracle is done using the where clause.

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7. An ____ or SELECT statement can include a Where clause.

  1. INSERT
  2. UPDATE
  3. DELETE
  4. All of the above

Answer: D) All of the above

Explanation:

An INSERT, UPDATE, DELETE, or SELECT statement can include a Where clause.

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8. What is the syntax of Oracle WHERE?

  1. WHERE conditions;
  2. Conditions WHERE;
  3. WHERE conditions condition_name;
  4. WHERE clause;

Answer: A) WHERE conditions;

Explanation:

The syntax of Oracle WHERE is:

WHERE conditions;

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9. Which of the following is a parameter in WHERE Clause?

  1. Expression
  2. Condition
  3. Value
  4. Pointer

Answer: B) Condition

Explanation:

Condition is the parameter in WHERE Clause.

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10. For determining which records to ____, conditions are used in the WHERE Clause.

  1. Add
  2. Retrieve
  3. Delete
  4. None

Answer: B) Retrieve

Explanation:

For determining which records to retrieve, conditions are used in the WHERE Clause.

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