Between and 对比 大于等于 小于等于

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表fin_invoice有一列created_date DATETIME，对该列已建索引，且数据库里有1.7万条记录，对比如下：

语句	explain输出中的type列
explain SELECT t.* FROM fin_invoice t where t.created_date >= ‘2019-10-01 00:00:00’ AND t.created_date <= ‘2019-10-31 23:59:59’	range
explain SELECT t.* FROM fin_invoice t where t.created_date >= ‘20191001 00:00:00’ AND t.created_date <= ‘20191031 23:59:59’	ALL
explain SELECT t.* FROM fin_invoice t where t.created_date between ‘2019-10-01 00:00:00’ AND ‘2019-10-31 23:59:59’	range
explain SELECT t.* FROM fin_invoice t where t.created_date between ‘20191001 00:00:00’ AND ‘20191031 23:59:59’	ALL
explain SELECT t.* FROM fin_invoice t where t.created_date between ‘2019-10-01 00:00:00’ AND ‘2019-10-01 23:59:59’ 注意是同一天	range
explain SELECT t.* FROM fin_invoice t where t.created_date between ‘20191001 00:00:00’ AND ‘20191001 23:59:59’ 注意是同一天	ALL