SQL for Bioinformatics
Key Concepts
JOIN type determines which rows survive: INNER JOIN — only matched rows; LEFT JOIN — all left rows, NULL for unmatched right side.
HAVING vs WHERE: WHERE filters before grouping; HAVING filters after. Use HAVING COUNT(*) > 3 to filter aggregate groups.
Subqueries vs JOINs: JOIN is more readable and usually faster. Subqueries with IN (SELECT ...) are clearer for small inner sets.
Always use parameterized queries: Never
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