按照日期范围查询有好几种方法，日期字段类型一般为：

Timestamp without timezone

方法一：

select * from user_info where create_date >= '2015-07-01' and create_date < '2015-08-15';

方法二：

select * from user_info where create_date between '2015-07-01' and '2015-08-15';

方法三：

select * from user_info where create_date >= '2015-07-01'::timestamp and create_date < '2015-08-15'::timestamp;

方法四：

select * from user_info where create_date between to_date('2015-07-01','YYYY-MM-DD') and to_date('2015-08-15','YYYY-MM-DD');