mysql中TIMESTAMPDIFF案例详解

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DAY，MINUTE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)        

来源：https://blog.csdn.net/baiyaoliang7445/article/details/102218767