You want to optimize a query that joins two large tables on a column and filters by a date range. Which combination of patterns will best improve performance?

hard📝 optimization Q15 of 15

PostgreSQL - Performance Tuning

AUse subqueries instead of JOINs; do not filter by date

BSelect all columns with *; avoid indexes to save space

CCreate indexes on join columns and filter columns; use EXPLAIN to check plan

DAdd ORDER BY on join column; remove WHERE clause

Step-by-Step Solution

Solution:

Step 1: Identify key optimization needs
Joining large tables and filtering by date needs indexes on join and filter columns.
Step 2: Use EXPLAIN to verify query plan
Checking the plan helps confirm indexes are used and query is efficient.
Final Answer:
Create indexes on join columns and filter columns; use EXPLAIN to check plan -> Option C
Quick Check:
Indexes + EXPLAIN = Best optimization [OK]

Quick Trick: Index join and filter columns; verify with EXPLAIN [OK]

Common Mistakes:

Selecting all columns wastes resources
Avoiding indexes slows queries
Removing WHERE loses filtering benefits

Master "Performance Tuning" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

You want to optimize a query that joins two large tables on a column and filters by a date range. Which combination of patterns will best improve performance?

Step 1: Identify key optimization needs

Step 2: Use EXPLAIN to verify query plan

Final Answer:

Quick Check:

Want More Practice?