Subtracting a day in MySQL

To subtract a day in MySQL, use the DATE_SUB() method. Let us first create a table −

mysql> create table DemoTable
   -> (
   -> AdmissionDate timestamp
   -> );
Query OK, 0 rows affected (1.05 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('2019-01-01');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values('2018-12-31');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('2017-03-13');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('2019-01-02');
Query OK, 1 row affected (0.08 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+---------------------+
| AdmissionDate       |
+---------------------+
| 2019-01-01 00:00:00 |
| 2018-12-31 00:00:00 |
| 2017-03-13 00:00:00 |
| 2019-01-02 00:00:00 |
+---------------------+
4 rows in set (0.00 sec)

Here is the query to subtract a day−

mysql> select date_sub(AdmissionDate,interval 1 day) from DemoTable;

This will produce the following output −

+----------------------------------------+
| date_sub(AdmissionDate,interval 1 day) |
+----------------------------------------+
| 2018-12-31 00:00:00                    |
| 2018-12-30 00:00:00                    |
| 2017-03-12 00:00:00                    |
| 2019-01-01 00:00:00                    |
+----------------------------------------+
4 rows in set (0.00 sec)