Create a joint index MySQL should pay attention to?
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2020-02-07 14:27:56
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- Joint index to follow the most left-prefix principles, we will not use the index
- Mysql using an index from left to right in the field, a query can be just a part of the index, but only the leftmost portion.
- The index is an index (a, b, c), or a support a, b or a, b, c to find combinations. 3, but not b, c to find
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