Mysql time function Summary

Mysql has some time functions, although not commonly used, but sometimes used for interviews.

1. Convert the current time to the timestamp

select  UNIX_TIMESTAMP();

2. We generally do not directly describe the specific age about age. Because age is constantly changing, we only need to give a birthday in the database. The SQL statement is as follows.

select name,birth,year(curdate())-year(birth())-(right(curdate(),5)-right(birth,5)) as age from peg oreder by name;

The output image of the preceding SQL statement is as follows:

+----------+------------+------------+------+

| name     | birth      | CURDATE()  | age  |

+----------+------------+------------+------+

| Bowser   | 1989-08-31 | 2003-08-19 |   13 |

| Buffy    | 1989-05-13 | 2003-08-19 |   14 |

| Chirpy   | 1998-09-11 | 2003-08-19 |    4 |

| Claws    | 1994-03-17 | 2003-08-19 |    9 |

| Fang     | 1990-08-27 | 2003-08-19 |   12 |

| Fluffy   | 1993-02-04 | 2003-08-19 |   10 |

| Puffball | 1999-03-30 | 2003-08-19 |    4 |

| Slim     | 1996-04-29 | 2003-08-19 |    7 |

| Whistler | 1997-12-09 | 2003-08-19 |    5 |

+----------+------------+------------+------+

3. If you want to calculate the animal born next month, the SQL statement is as follows.

Statement 1:

SELECT name, birth FROM pet WHERE MONTH(birth) = MONTH(DATE_ADD(CURDATE(),INTERVAL 1 MONTH));

Statement 2:

select name,birth from pet where month(birth)=mod(month(curdate(),12)+1;

The reason for writing this is that in February December, if we add 1 to it, it will become 13.