Syntax error MySQL query to order by two fields and NULL values in chronological order?

MySQL query to order by two fields and NULL values in chronological order?

Let us first create a table −

mysql> create table DemoTable
-> (
-> FirstName varchar(100),
-> LastName varchar(100)
-> );
Query OK, 0 rows affected (1.39 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Sam','Brown');
Query OK, 1 row affected (0.25 sec)

mysql> insert into DemoTable values(null,'Smith');
Query OK, 1 row affected (0.16 sec)

mysql> insert into DemoTable values('David','Taylor');
Query OK, 1 row affected (0.22 sec)

mysql> insert into DemoTable values('Mike',null);
Query OK, 1 row affected (0.45 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

This will produce the following output −

+-----------+----------+
| FirstName | LastName |
+-----------+----------+
| Sam       | Brown    |
| NULL      | Smith    |
| David     | Taylor   |
| Mike      | NULL     |
+-----------+----------+
4 rows in set (0.06 sec)

Here is the query to order by two fields and possibly NULL values in chronological order −

mysql> select *from DemoTable order by coalesce(FirstName,LastName);

Output

This will produce the following output −

+-----------+----------+
| FirstName | LastName |
+-----------+----------+
| David     | Taylor   |
| Mike      | NULL     |
| Sam       | Brown    |
| NULL      | Smith    |
+-----------+----------+
4 rows in set (0.04 sec)
Updated on: 2020-06-30T11:51:42+05:30

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