query-optimization

Installation
SKILL.md

Query Optimization

Comprehensive guide to T-SQL query optimization techniques.

Quick Reference

SARGable vs Non-SARGable Patterns

Non-SARGable (Bad) SARGable (Good)
WHERE YEAR(Date) = 2024 WHERE Date >= '2024-01-01' AND Date < '2025-01-01'
WHERE LEFT(Name, 3) = 'ABC' WHERE Name LIKE 'ABC%'
WHERE Amount * 1.1 > 1000 WHERE Amount > 1000 / 1.1
WHERE ISNULL(Col, 0) = 5 WHERE Col = 5 OR Col IS NULL
WHERE VarcharCol = 123 WHERE VarcharCol = '123'

Join Types Performance

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Jan 24, 2026