Bird
0
0

What is the main purpose of using EXPLAIN before running a SQL query?

easy📝 Conceptual Q11 of 15
SQL - Indexes and Query Performance
What is the main purpose of using EXPLAIN before running a SQL query?
ATo see how the database plans to execute the query
BTo delete data from the database
CTo create a new table
DTo insert new rows into a table
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of EXPLAIN

    EXPLAIN shows the steps the database will take to run a query, like a map of the plan.

  2. Step 2: Identify the correct purpose

    It helps find slow parts and optimize queries, not to modify data or structure.

  3. Final Answer:

    To see how the database plans to execute the query -> Option A

  4. Quick Check:

    EXPLAIN = query plan [OK]
Quick Trick: EXPLAIN shows query steps, not data changes [OK]
Common Mistakes:
  • Thinking EXPLAIN modifies data
  • Confusing EXPLAIN with data manipulation commands
  • Assuming EXPLAIN creates or deletes tables

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More SQL Quizzes
Advanced Query Patterns - Finding gaps in sequences - Quiz 11easy Advanced Query Patterns - Conditional aggregation pattern - Quiz 14medium Advanced Window Functions - LAG function for previous row access - Quiz 4medium CASE Expressions - Searched CASE syntax - Quiz 11easy Common Table Expressions (CTEs) - CTE vs subquery vs view decision - Quiz 14medium Common Table Expressions (CTEs) - Recursive CTE concept - Quiz 7medium Stored Procedures and Functions - CURSOR concept and usage - Quiz 6medium Stored Procedures and Functions - CREATE PROCEDURE syntax - Quiz 4medium Window Functions Fundamentals - ROW_NUMBER function - Quiz 12easy Window Functions Fundamentals - RANK and DENSE_RANK difference - Quiz 4medium