Order by date and set the empty dates in the last with the help of ORDER BY clause and IS NULL property. The syntax is as follows:
SELECT *FROM yourTableName ORDER BY (yourDateColumnName IS NULL), yourDateColumnName DESC;
In the above syntax, we will sort the NULL first after that date. To understand the above syntax, let us create a table. The query to create a table is as follows:
mysql> create table DateColumnWithNullDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> LoginDateTime datetime, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.84 sec)
Insert some records in the table using insert command. The query is as follows:
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values(date_add(now(),interval -1 year));
Query OK, 1 row affected (0.15 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values(NULL);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values(NULL);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values(now());
Query OK, 1 row affected (0.18 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values(curdate());
Query OK, 1 row affected (0.23 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values('2017-08-25 15:30:35');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values(NULL);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values('2016-12-25 16:55:55');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values(NULL);
Query OK, 1 row affected (0.22 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values('2014-11-12 10:20:23');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DateColumnWithNullDemo(LoginDateTime) values('2020-01-01 06:45:23');
Query OK, 1 row affected (0.23 sec)Display all records from the table using select statement. The query is as follows:
mysql> select *from DateColumnWithNullDemo;
The following is the output:
+----+---------------------+ | Id | LoginDateTime | +----+---------------------+ | 1 | 2018-01-29 17:07:20 | | 2 | NULL | | 3 | NULL | | 4 | 2019-01-29 17:07:54 | | 5 | 2019-01-29 00:00:00 | | 6 | 2017-08-25 15:30:35 | | 7 | NULL | | 8 | 2016-12-25 16:55:55 | | 9 | NULL | | 10 | 2014-11-12 10:20:23 | | 11 | 2020-01-01 06:45:23 | +----+---------------------+ 11 rows in set (0.00 sec)
Here is the query to set the NULL value at last and sort the date in descending order:
mysql> select *from DateColumnWithNullDemo -> order by (LoginDateTime IS NULL), LoginDateTime DESC;
The following is the output:
+----+---------------------+ | Id | LoginDateTime | +----+---------------------+ | 11 | 2020-01-01 06:45:23 | | 4 | 2019-01-29 17:07:54 | | 5 | 2019-01-29 00:00:00 | | 1 | 2018-01-29 17:07:20 | | 6 | 2017-08-25 15:30:35 | | 8 | 2016-12-25 16:55:55 | | 10 | 2014-11-12 10:20:23 | | 2 | NULL | | 3 | NULL | | 7 | NULL | | 9 | NULL | +----+---------------------+ 11 rows in set (0.00 sec)