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Title: Java-Interview/MD/SQL-optimization.md at master · constack/Java-Interview · GitHub

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	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#sql-优化
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#负向查询不能使用索引
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#前导模糊查询不能使用索引
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#数据区分不明显的不建议创建索引
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#字段的默认值不要为-null
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#在字段上进行计算不能命中索引
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#最左前缀问题
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#如果明确知道只有一条记录返回
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#不要让数据库帮我们做强制类型转换
	https://github.com/constack/Java-Interview/blob/master/MD/SQL-optimization.md#如果需要进行-join-的字段两表的字段类型要相同
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