Tag: databases

Questions Related to databases

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

  1. True

  2. False


Correct Option: B
  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


Correct Option: C
  1. Table1.column1=Table2.column2

  2. Table1.column1=Table2.column1

  3. Table1.column2=Table2.column1

  4. None of the above


Correct Option: B
  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


Correct Option: A

____________ is used to join a table to itself.

  1. Selfjoin

  2. Outerjoin

  3. innerjoin

  4. equijoin


Correct Option: A
  1. True

  2. False


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