Tag: databases

Questions Related to databases

To select all the columns from a table EMP, which one of the following is TRUE?

technology databases

  1. Select all columns from EMP;

  2. Select distinct columns from EMP;

  3. Select * from EMP;

  4. All of the above

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Correct Option: C

Select ename from emp where ename =”Scott”; This select statement executes successfully.

technology databases

  1. True

  2. False

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Correct Option: B

A Literal is enclosed in double quotes.

technology databases

  1. True

  2. False

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Correct Option: B

SQL is
technology databases

  1. Structured Query Language

  2. Standard Query Language

  3. System Query Language

  4. Simple Query Language

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Correct Option: A

Limiting the rows in a select statement for a specific condition is done by the clause
technology databases

  1. Distinct

  2. Projection

  3. Where

  4. All of the above

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Correct Option: C

Character values are case insensitive
technology databases

  1. True

  2. False

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Correct Option: B

Arithmetic expressions containing a null value evaluate to null.

technology databases

  1. True

  2. False

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Correct Option: B
Explanation:

To solve this question, the user needs to know the concept of null values in arithmetic expressions.

The correct answer is:

The Answer is: B

Explanation:

The statement is false. Arithmetic expressions containing a null value do not evaluate to null. In most programming languages, performing arithmetic operations with a null value will result in the entire expression evaluating to null. However, this behavior depends on the programming language and the data type being used. In some cases, arithmetic expressions with null values may result in a runtime error or undefined behavior.

Concatenation operator is
technology databases

  1. +

  2. -

  3. ||

  4. *

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Correct Option: C

What are SQL “SELECT” statement capabilities.
technology databases

  1. Projection

  2. Selection

  3. Join

  4. All of the above

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Correct Option: D

To select all the columns from a table EMP, which one of the following is TRUE?
technology databases

  1. Select all columns from EMP;

  2. Select distinct columns from EMP;

  3. Select * from EMP;

  4. All of the above

Show answer
Correct Option: C