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MySQL Order by with case?
For this, use order by nullif(). Let us first create a table −
mysql> create table DemoTable672( CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, CustomerName varchar(100), CustomerAmount int ); Query OK, 0 rows affected (0.81 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('Chris',560);
Query OK, 1 row affected (0.51 sec)
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('Robert',null);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('',450);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('David',456);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable672(CustomerName,CustomerAmount) values('Carol',786);
Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −
mysql> select *from DemoTable672;
This will produce the following output −
+------------+--------------+----------------+ | CustomerId | CustomerName | CustomerAmount | +------------+--------------+----------------+ | 1 | Chris | 560 | | 2 | Robert | NULL | | 3 | | 450 | | 4 | David | 456 | | 5 | Carol | 786 | +------------+--------------+----------------+ 5 rows in set (0.00 sec)
Following is how you can perform MySQL order by with case. Here, we have also used FIELD() for case-insensitive search −
mysql> select *from DemoTable672 ORDER BY NULLIF(CustomerName,'') IS NULL, FIELD(CustomerAmount,560,786,450,456);
This will produce the following output −
+------------+--------------+----------------+ | CustomerId | CustomerName | CustomerAmount | +------------+--------------+----------------+ | 2 | Robert | NULL | | 1 | Chris | 560 | | 5 | Carol | 786 | | 4 | David | 456 | | 3 | | 450 | +------------+--------------+----------------+ 5 rows in set (0.04 sec)
Updated on: 26-Aug-2019
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