Tag: databases

Questions Related to databases

Sorting SQL statement result data by column alias is not possible.

technology databases

  1. True

  2. False

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Correct Option: B

What are the two types of SQL Functions?

technology databases

  1. Single-row Functions and Double-row Functions

  2. One-row Functions and Two-row Functions

  3. Single-row Functions and Multiple-row Functions

  4. None of the above

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Correct Option: C

Single-Row Functions can return multiple results per row.

technology databases

  1. True

  2. False

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Correct Option: B

Compare the output of the following: SELECT TRUNC(99.57,1) FROM DUAL; and SELECT ROUND(99.57,1) FROM DUAL;

technology databases

  1. 99.57,99,6

  2. 99.5,99.6

  3. 99.6,99.6

  4. 99.57,99.57

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Correct Option: B

LAST_DAY(date) finds the date of the last day of the month that contains date.

technology databases

  1. True

  2. False

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Correct Option: B

Which of the following WHERE clauses represent equi-join?

technology databases

  1. Table1.column1=Table2.column2

  2. Table1.column1=Table2.column1

  3. Table1.column2=Table2.column1

  4. None of the above

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Correct Option: B

An outer join is used to:

technology databases

  1. Return records which have no direct match

  2. Return records which have direct match

  3. Return all the records

  4. None of the above

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Correct Option: A

____________ is the outer join operator.

technology databases

  1. (+)

  2. (-)

  3. (*)

  4. +

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Correct Option: A

____________ is used to join a table to itself.

technology databases

  1. Selfjoin

  2. Outerjoin

  3. innerjoin

  4. equijoin

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Correct Option: A

A null is the same as zero or a blank space.

technology databases

  1. True

  2. False

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Correct Option: B
Explanation:

To solve this question, the user needs to know the definition of a null value. A null value typically represents a missing or unknown value, and it is not the same as a zero or a blank space.

Option A - True: This option is incorrect. A null value is not equivalent to zero or a blank space. In programming, null is often used to indicate the absence of a value or a missing value.

Option B - False: This option is correct. A null value is not the same as zero or a blank space. It is a distinct value that represents an absence of data.

Therefore, the correct answer is:

The Answer is: B. False