mysql中TIMESTAMPDIFF简单记录

1.  Syntax

TIMESTAMPDIFF(unit,begin,end); 根据单位返回时间差,对于传入的begin和end不需要相同的数据结构,可以存在一个为Date一个DateTime

2. Unit

支持的单位有

  • MICROSECOND
  • SECOND
  • MINUTE
  • HOUR
  • DAY
  • WEEK
  • MONTH
  • QUARTER
  • YEAR

3. Example

下面这个例子是对于TIMESTAMPDIFF最基本的用法,

  • 3.1 求 2017-01-01 - 2017-02-01 之间有几个月
SELECT TIMESTAMPDIFF(MONTH, '2017-01-01', '2017-02-01') as  result;

+--------+
| result |
+--------+
| 1 |
+--------+
1 row in set (0.00 sec)
  • 3.2 求 2017-01-01 - 2017-02-01 之间有几天
SELECT TIMESTAMPDIFF(DAY, '2017-01-01', '2017-02-01') as  result;

+--------+
| result |
+--------+
| 31 |
+--------+
1 row in set (0.00 sec)
  •  3.3 求 2017-01-01 08: 00:00 - 2017-01-01 08: 55:00 之间有几分钟
SELECT TIMESTAMPDIFF(MINUTE, '2017-01-01 08:00:00', '2017-01-01 08:55:00') result;

+--------+
| result |
+--------+
| 55 |
+--------+
1 row in set (0.00 sec)
  •  3.4 求 2017-01-01 08: 00:00 - 2017-01-01 08: 55:33 之间有几分钟
SELECT TIMESTAMPDIFF(MINUTE, '2017-01-01 08:00:00', '2017-01-01 08:55:33') result;

+--------+
| result |
+--------+
| 55 |
+--------+
1 row in set (0.00 sec)
  •  3.5 对于DAY MINUTE进行计算DIFF时,会直接将相对应的DAYMINUTE相减

  • 3.6 对于 SECOND 会怎样计算呢
SELECT TIMESTAMPDIFF(SECOND, '2017-01-01 08:00:00', '2017-01-01 08:55:33') result;

55 * 60 + 33 = 3333
+--------+ | result | +--------+ | 3333 | +--------+ 1 row in set (0.00 sec)
  • 3.7 如何求数据库中两个date字段的diff
    • 3.7.1  建表
CREATE TABLE demo (id INT AUTO_INCREMENT PRIMARY KEY, start_time DATE NOT NULL, end_time DATE NOT NULL);
Query OK, 0 rows affected (0.10 sec)
    • 3.7.2  添加数据
INSERT INTO demo(start_time, end_time)
VALUES('1983-01-01', '1990-01-01'),
('1983-01-01', '1989-06-06'),
('1983-01-01', '1985-03-02'),
('1983-01-01', '1992-05-05'),
('1983-01-01 11:12:11', '1995-12-01');
    • 3.7.3 直接query数据
select * from demo;
+----+------------+------------+
| id | start_time | end_time |
+----+------------+------------+
| 1 | 1983-01-01 | 1990-01-01 |
| 2 | 1983-01-01 | 1989-06-06 |
| 3 | 1983-01-01 | 1985-03-02 |
| 4 | 1983-01-01 | 1992-05-05 |
| 5 | 1983-01-01 | 1995-12-01 |
+----+------------+------------+
5 rows in set (0.00 sec)
    • 3.7.4 计算duration
select *, TIMESTAMPDIFF(YEAR, start_time, end_time) as duration from demo;

+----+------------+------------+----------+
| id | start_time | end_time | duration |
+----+------------+------------+----------+
| 1 | 1983-01-01 | 1990-01-01 | 7 |
| 2 | 1983-01-01 | 1989-06-06 | 6 |
| 3 | 1983-01-01 | 1985-03-02 | 2 |
| 4 | 1983-01-01 | 1992-05-05 | 9 |
| 5 | 1983-01-01 | 1995-12-01 | 12 |
+----+------------+------------+----------+
5 rows in set (0.00 sec)
    • 3.7.5 其他应用
select *, if(TIMESTAMPDIFF(YEAR, end_time, CURRENT_TIMESTAMP())< 26 ,'< 26','>= 26') as result from demo;

+----+------------+------------+--------+
| id | start_time | end_time | result |
+----+------------+------------+--------+
| 1 | 1983-01-01 | 1990-01-01 | >= 26 |
| 2 | 1983-01-01 | 1989-06-06 | >= 26 |
| 3 | 1983-01-01 | 1985-03-02 | >= 26 |
| 4 | 1983-01-01 | 1992-05-05 | < 26 |
| 5 | 1983-01-01 | 1995-12-01 | < 26 |
+----+------------+------------+--------+
5 rows in set (0.00 sec)
posted @ 2018-01-25 15:08  戴杭林  阅读(...)  评论(... 编辑 收藏