How to compare timestamps in MySQL?

To compare timestamps in MySQL, you can use DATE(). Let us first create a table−

mysql> create table comparingTimestampDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> AdmissionDate timestamp    -> ); Query OK, 0 rows affected (0.54 sec)

Following is the query to insert records in the table using insert command −

mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-03-31'); Query OK, 1 row affected (0.13 sec) mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-04-10'); Query OK, 1 row affected (0.12 sec) mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-04-15'); Query OK, 1 row affected (0.17 sec) mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-03-29'); Query OK, 1 row affected (0.15 sec) mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-04-07'); Query OK, 1 row affected (0.18 sec)

Following is the query to display all records from the table using select statement −

mysql> select * from comparingTimestampDemo;

This will produce the following output −

+----+---------------------+ | Id | AdmissionDate | +----+---------------------+ | 1 | 2019-03-31 00:00:00 | | 2 | 2019-04-10 00:00:00 | | 3 | 2019-04-15 00:00:00 | | 4 | 2019-03-29 00:00:00 | | 5 | 2019-04-07 00:00:00 | +----+---------------------+ 5 rows in set (0.00 sec)

Let us now compare timestamps in MySQL −

mysql> SELECT DATE(`AdmissionDate`) FROM comparingTimestampDemo WHERE DATE(`AdmissionDate`) < CURDATE() - INTERVAL 3 DAY;

This will produce the following output −

+-----------------------+ | DATE(`AdmissionDate`) | +-----------------------+ | 2019-03-31 | | 2019-03-29 | +-----------------------+ 2 rows in set (0.00 sec)