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Can we use IFNULL along with MySQL ORDER BY?
You can use IFNULL along with ORDER BY clause. The syntax is as follows −
SELECT *FROM yourTableName ORDER BY IFNULL(yourColumnName1,yourColumnName2);
To understand the above syntax, let us create a table. The query to create a table is as follows −
mysql> create table IfNullDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> ProductName varchar(10), -> ProductWholePrice float, -> ProductRetailPrice float, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (1.19 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into IfNullDemo(ProductName,ProductWholePrice,ProductRetailPrice) values('Product-1',99.50,150.50);
Query OK, 1 row affected (0.21 sec)
mysql> insert into IfNullDemo(ProductName,ProductWholePrice,ProductRetailPrice) values('Product-2',NULL,76.56);
Query OK, 1 row affected (0.18 sec)
mysql> insert into IfNullDemo(ProductName,ProductWholePrice,ProductRetailPrice) values('Product-3',105.40,NULL);
Query OK, 1 row affected (0.20 sec)
mysql> insert into IfNullDemo(ProductName,ProductWholePrice,ProductRetailPrice) values('Product-4',NULL,NULL);
Query OK, 1 row affected (0.18 sec)
mysql> insert into IfNullDemo(ProductName,ProductWholePrice,ProductRetailPrice) values('Product-5',209.90,400.50);
Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement. The query is as follows −
mysql> select *from IfNullDemo;
The following is the output −
+----+-------------+-------------------+--------------------+ | Id | ProductName | ProductWholePrice | ProductRetailPrice | +----+-------------+-------------------+--------------------+ | 1 | Product-1 | 99.5 | 150.5 | | 2 | Product-2 | NULL | 76.56 | | 3 | Product-3 | 105.4 | NULL | | 4 | Product-4 | NULL | NULL | | 5 | Product-5 | 209.9 | 400.5 | +----+-------------+-------------------+--------------------+ 5 rows in set (0.02 sec)
Here is the query to order by if null −
mysql> select *from IfNullDemo order by ifnull(ProductWholePrice,ProductRetailPrice);
The following is the output −
+----+-------------+-------------------+--------------------+ | Id | ProductName | ProductWholePrice | ProductRetailPrice | +----+-------------+-------------------+--------------------+ | 4 | Product-4 | NULL | NULL | | 2 | Product-2 | NULL | 76.56 | | 1 | Product-1 | 99.5 | 150.5 | | 3 | Product-3 | 105.4 | NULL | | 5 | Product-5 | 209.9 | 400.5 | +----+-------------+-------------------+--------------------+ 5 rows in set (0.00 sec)
Updated on: 2019-07-30T22:30:24+05:30
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