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Query non-empty values of a row first in ascending order and then display NULL values
For this, use ORDER BY ISNULL(). Let us first create a table −
mysql> create table DemoTable669 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentScore int ); Query OK, 0 rows affected (0.55 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable669(StudentScore) values(45) ; Query OK, 1 row affected (0.80 sec) mysql> insert into DemoTable669(StudentScore) values(null); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable669(StudentScore) values(89); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable669(StudentScore) values(null); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable669;
This will produce the following output −
+-----------+--------------+ | StudentId | StudentScore | +-----------+--------------+ | 1 | 45 | | 2 | NULL | | 3 | 89 | | 4 | NULL | +-----------+--------------+ 4 rows in set (0.00 sec)
Following is the query to display non-empty values in ascending order. The null values would be displayed afterwards −
mysql> select *from DemoTable669 ORDER BY ISNULL(StudentScore),StudentScore;
This will produce the following output −
+-----------+--------------+ | StudentId | StudentScore | +-----------+--------------+ | 1 | 45 | | 3 | 89 | | 2 | NULL | | 4 | NULL | +-----------+--------------+ 4 rows in set (0.00 sec)
Updated on: 21-Jan-2020
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