oracle仅插入时间

oracle insert only time(oracle仅插入时间)

问题描述

我想将数据作为时间而不是日期插入数据库.如果我使用 to_date('2012-08-31 07:39:33', 'YYYY-MM-DD HH24:MI:SS') 它也会添加日期.如果我使用 to_date('09:34:00', 'HH24:MI:SS') 它也会添加年、月、日，从无到有:|后来我需要获取时间在 x 和 y 之间的行，而不考虑年、月或日.我怎么做?谢谢

I would like to insert data to db as time, not date. If I use to_date('2012-08-31 07:39:33', 'YYYY-MM-DD HH24:MI:SS') it adds date too. If I use to_date('09:34:00', 'HH24:MI:SS') it adds year, month, day as well, from nowhere :| Later I need to get rows where time is between x and y, not taking in account the year, month or day. How do I do that? thanks

推荐答案

DATE 类型总是包含日期组件.

A DATE type always includes the date component.

一种选择是继续使用 DATE 并编写代码以忽略日期组件.为了使查询更高效，您可能希望在诸如 TO_CHAR( date_field, 'HH24:MI:SS' ) 之类的内容上创建基于函数的索引，并在查询中使用该表达式.

One option is to continue using DATE and write your code to ignore the date component. In order to make queries on the time efficient, you might want to create a function-based index on something like TO_CHAR( date_field, 'HH24:MI:SS' ) and use that expression in your queries.

或者，您可以使用 NUMBER 字段来存储自午夜以来的秒数，并据此编写查询.

Alternatively, you could use a NUMBER field to store the number of seconds since midnight, and write your queries in terms of that.

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