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10 Rules 👇 ━━━━━━━━━━━━━━━━━━━━ 1 → Index your WHERE columns 2 → Left-most column first in composite indexes 3 → Never wrap indexed columns in functions 4 → Avoid SELECT * 5 → Use covering indexes for read-heavy queries 6 → Index ALL your JOIN columns 7 → Skip low cardinality columns 8 ...
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