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Update mysql-high-performance-optimization-specification-recommendations.md

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docs/database/mysql/mysql-high-performance-optimization-specification-recommendations.md
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@ -252,10 +252,12 @@ Innodb 是按照主键索引的顺序来组织表的
隐式转换会导致索引失效如: 隐式转换会导致索引失效如:
``` ```sql
select name,phone from customer where id = '111'; select name,phone from customer where id = '111';
``` ```
详细解读可以看：[MySQL中的隐式转换造成的索引失效](./index-invalidation-caused-by-implicit-conversion.md) 这篇文章。
### 3. 充分利用表上已经存在的索引 ### 3. 充分利用表上已经存在的索引
避免使用双%号的查询条件。如：`a like '%123%'`，（如果无前置%,只有后置%，是可以用到列上的索引的） 避免使用双%号的查询条件。如：`a like '%123%'`，（如果无前置%,只有后置%，是可以用到列上的索引的）