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What is the main purpose of using a nested subquery in SQL?

easy📝 Conceptual Q1 of 15
SQL - Subqueries
What is the main purpose of using a nested subquery in SQL?
ATo create multiple tables at once
BTo delete all rows from a table
CTo update multiple columns simultaneously
DTo use the result of one query inside another query
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of subqueries

    A subquery is a query inside another query that provides a result to the outer query.

  2. Step 2: Identify the purpose of nesting

    Nesting allows the outer query to use the inner query's result to filter or calculate data.

  3. Final Answer:

    To use the result of one query inside another query -> Option D

  4. Quick Check:

    Nested subquery purpose = Use result inside another query [OK]
Quick Trick: Nested subqueries let queries talk to each other [OK]
Common Mistakes:
MISTAKES
  • Thinking nested subqueries create tables
  • Confusing with update or delete operations
  • Assuming nested subqueries run independently

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