[Solved] Why does this query fail?SELECT indexrelname, idx_scan FROM pg_stat_user_indexes WHERE idx_scan > 100 ORDER BY idx_scan DESC LIMIT; | PostgreSQL

PostgreSQL - Indexing Strategies

Why does this query fail?

SELECT indexrelname, idx_scan FROM pg_stat_user_indexes WHERE idx_scan > 100 ORDER BY idx_scan DESC LIMIT;

Aidx_scan cannot be used in ORDER BY

BORDER BY cannot be used with LIMIT

CLIMIT requires a number specifying how many rows to return

DMissing WHERE clause condition

Step-by-Step Solution

Solution:

Step 1: Check LIMIT syntax
LIMIT must be followed by a number indicating how many rows to return.
Step 2: Identify the error
The query has LIMIT without a number, causing a syntax error.
Final Answer:
LIMIT requires a number specifying how many rows to return -> Option C
Quick Check:
LIMIT needs a count number [OK]

Quick Trick: Always specify a number after LIMIT [OK]

Common Mistakes:

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Why does this query fail?