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What does the EXPLAIN command in PostgreSQL primarily show?

easy📝 Conceptual Q11 of 15
PostgreSQL - Performance Tuning
What does the EXPLAIN command in PostgreSQL primarily show?
AHow PostgreSQL plans to execute a query
BThe exact data returned by the query
CThe syntax errors in the query
DThe database schema structure
Step-by-Step Solution
Solution:
  1. Step 1: Understand the purpose of EXPLAIN

    EXPLAIN shows the query plan, which is how PostgreSQL intends to run the query.
  2. Step 2: Differentiate from other commands

    It does not show actual data or errors, only the plan.
  3. Final Answer:

    How PostgreSQL plans to execute a query -> Option A
  4. Quick Check:

    EXPLAIN = query plan [OK]
Quick Trick: EXPLAIN = query plan, not data or errors [OK]
Common Mistakes:
  • Thinking EXPLAIN shows query results
  • Confusing EXPLAIN with syntax error checks
  • Assuming EXPLAIN shows database schema

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