10 Practical Ways to Improve SQL Query Performance (With Real Examples)

Query Optimization in MySQL, PostgreSQL, SQL Server, or even Oracle
#mysql #postgresql #sqlserver #oracle
Top 10 Query Optimization Strategies
· 🧩 1. Use SELECT * Sparingly
· ⚡ 2. Create Proper Indexes
· 🧮 3. Avoid Functions on Indexed Columns in WHERE Clause
· 🧠 4. Analyze Execution Plans (Know What’s Happening)
· 🧩 5. Use Joins Instead of Subqueries (When Possible)
· ⚙️ 6. Limit Result Set Early
· 🔄 7. Avoid Wildcards at the Start of LIKE
· 💾 8. Normalize, But Not Too Much
· 🧱 9. Use Appropriate Data Types
· 🧹 10. Keep Your Statistics and Indexes Updated
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