Question

我必须计算死亡的马的年龄，multiply by 3以获得可比的人类年龄。列出他们的horse_id，名称和human years，按horse_id排序。

我是一个菜鸟，只是无法理解我需要做什么，在网上看这是我能得到的最接近的，Born和Died列是日期，但只有一年。

任何帮助都将不胜感激。

SELECT Horse_id, name, Born, Died,
TIMESTAMPDIFF(YEAR, Died, Born)*3 AS 'Human Years'
FROM horsedb.horse 
ORDER BY Horse_id;

Answer 1

你的尝试看起来很好 - 你从中获得了什么结果？这是我会尝试的：

SELECT Horse_id, name, Born, Died,
       (YEAR(Died) - YEAR(Born)) * 3 AS 'Human Years'
FROM horsedb.horse 
ORDER BY Horse_id;

Answer 2

我会在几个月内完成计算。。。将月数除以4.这是一种方法：

SELECT Horse_id, name, Born, Died,
       FLOOR( (YEAR(Died)*12 + MONTH(Died)) - (YEAR(Born)*12 + Month(Born)) / 4) as HumanYears
FROM horsedb.horse 
ORDER BY Horse_id;

MYSQL计算并乘以年龄

2 个答案: