What operator tests column for absence of data

DWQA QuestionsCategory: SQLWhat operator tests column for absence of data
Editor Staff asked 10 months ago

What operator tests column for absence of data

  1. NOT Operator
  2. Exists Operator
  3. IS NULL Operator
  4. None of the above
1 Answers
Editor Staff answered 10 months ago

C-IS NULL Operator
Explanation: The IS NULL operator is used to testing the empty values in the table’s column. It returns true if column values are NULL.
The NOT operator gives the result only when the specified condition is not true.
The EXISTS operator used in combination with a subquery, and if a subquery returns any record, this operator returns true. Otherwise, it will return false.