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MySQL federated index and BTREE
2022-06-11 19:05:00 【Hindsight 2022】
The leftmost prefix principle of joint index
The following rules ：
If you want to use a federated index , The leftmost column of a union index must be used as a filter condition , Otherwise, the federated index will not take effect .
7. Joint index （ Leftmost prefix principle ）_ Programmer Xiaomuzhi's blog -CSDN Blog _ Joint index
explain select * from a
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