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What key information does the EXPLAIN command provide about a PostgreSQL query?

easy📝 Conceptual Q1 of 15
PostgreSQL - Performance Tuning
What key information does the EXPLAIN command provide about a PostgreSQL query?
AThe execution plan showing how the query will be processed
BThe exact number of rows returned by the query
CThe syntax errors in the query
DThe list of tables involved in the database
Step-by-Step Solution
Solution:
  1. Step 1: Understand EXPLAIN's purpose

    The EXPLAIN command shows the execution plan, detailing how PostgreSQL intends to execute the query.
  2. Step 2: Differentiate from other outputs

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

    The execution plan showing how the query will be processed -> Option A
  4. Quick Check:

    EXPLAIN outputs the query plan [OK]
Quick Trick: EXPLAIN shows query execution plan, not results [OK]
Common Mistakes:
  • Confusing EXPLAIN with actual query output
  • Expecting EXPLAIN to show syntax errors
  • Assuming EXPLAIN returns row counts

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