Bird
0
0

Which situation best shows why subqueries are needed?

easy📝 Conceptual Q2 of 15
SQL - Subqueries
Which situation best shows why subqueries are needed?
AWhen you want to filter rows based on values from another table
BWhen you want to rename a column permanently
CWhen you want to delete the entire database
DWhen you want to backup the database
Step-by-Step Solution
Solution:

  1. Step 1: Identify use cases for subqueries

    Subqueries help filter data using results from another query, often from a different table.

  2. Step 2: Match options to subquery use

    Only When you want to filter rows based on values from another table describes filtering rows based on another table's data, which requires subqueries.

  3. Final Answer:

    When you want to filter rows based on values from another table -> Option A

  4. Quick Check:

    Subqueries needed for cross-table filtering = true [OK]
Quick Trick: Use subqueries to filter using another table's data [OK]
Common Mistakes:
MISTAKES
  • Confusing subqueries with schema changes
  • Thinking subqueries rename columns
  • Mixing subqueries with backup tasks

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More SQL Quizzes
Aggregate Functions - Why aggregation is needed - Quiz 9hard Aggregate Functions - AVG function - Quiz 2easy Aggregate Functions - MIN and MAX functions - Quiz 12easy GROUP BY and HAVING - GROUP BY with ORDER BY - Quiz 9hard GROUP BY and HAVING - How GROUP BY changes query execution - Quiz 14medium GROUP BY and HAVING - GROUP BY with ORDER BY - Quiz 6medium INNER JOIN - INNER JOIN with table aliases - Quiz 14medium LEFT and RIGHT JOIN - LEFT JOIN preserving all left rows - Quiz 11easy Table Relationships - One-to-many relationship design - Quiz 13medium Views - Dropping and altering views - Quiz 9hard