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What is the leftmost and most prefixed principle of MySQL?
2022-02-04 16:52:37 【Alibaba cloud Q & A】
MySQL Leftmost of 、 What is the most important principle ？
Take the answer 1：
Leftmost prefix principle , It's the top left priority , When creating a multi-column index , According to business needs ,where The most frequently used column in the clause is at the far left .
When we create a composite index , Such as (k1,k2,k3), It's equivalent to creating （k1）、(k1,k2) and (k1,k2,k3) Three indexes , This is the left most matching principle ..
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