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Common situations of mysql index failure

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PHP Chinese website brings to you common situations in which mysql indexes fail: 1. Using functions or operations; 2. Implicit type conversion; 3. Using not equal to (!= or <>); 4. Using the LIKE operator, and Starting with a wildcard; 5. OR condition; 6. NULL value; 7. Low index selectivity, etc.

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time：2024-02-23 17:53:41
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