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Count two different columns in a single query in MySQL?
You can use CASE statement to count two different columns in a single query. To understand the concept, let us first create a table. The query to create a table is as follows.
mysql> create table CountDifferentDemo - > ( - > ProductId int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > ProductName varchar(20), - > ProductColor varchar(20), - > ProductDescription varchar(20) - > ); Query OK, 0 rows affected (1.06 sec)
Insert some records in the table using insert command.
The query is as follows
mysql> insert into CountDifferentDemo(ProductName,ProductColor,ProductDescription) values('Product-1','Red','Used');
Query OK, 1 row affected (0.46 sec)
mysql> insert into CountDifferentDemo(ProductName,ProductColor,ProductDescription) values('Product-1','Blue','Used');
Query OK, 1 row affected (0.17 sec)
mysql> insert into CountDifferentDemo(ProductName,ProductColor,ProductDescription) values('Product-2','Green','New');
Query OK, 1 row affected (0.12 sec)
mysql> insert into CountDifferentDemo(ProductName,ProductColor,ProductDescription) values('Product-2','Blue','New');
Query OK, 1 row affected (0.14 sec)
mysql> insert into CountDifferentDemo(ProductName,ProductColor,ProductDescription) values('Product-3','Green','New');
Query OK, 1 row affected (0.21 sec)
mysql> insert into CountDifferentDemo(ProductName,ProductColor,ProductDescription) values('Product-4','Blue','Used');
Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement.
The query is as follows
mysql> select *from CountDifferentDemo;
The following is the output
+-----------+-------------+--------------+--------------------+ | ProductId | ProductName | ProductColor | ProductDescription | +-----------+-------------+--------------+--------------------+ | 1 | Product-1 | Red | Used | | 2 | Product-1 | Blue | Used | | 3 | Product-2 | Green | New | | 4 | Product-2 | Blue | New | | 5 | Product-3 | Green | New | | 6 | Product-4 | Blue | Used | +-----------+-------------+--------------+--------------------+ 6 rows in set (0.01 sec)
Here is the query to count two different columns in a single query i.e. we are counting the occurrence of a particular color “Red” and description “New”
mysql> select ProductName, - > SUM(CASE WHEN ProductColor = 'Red' THEN 1 ELSE 0 END) AS Color, - > SUM(CASE WHEN ProductDescription = 'New' THEN 1 ELSE 0 END) AS Desciption - > from CountDifferentDemo - > group by ProductName;
The following is the output
+-------------+-------+------------+ | ProductName | Color | Desciption | +-------------+-------+------------+ | Product-1 | 1 | 0 | | Product-2 | 0 | 2 | | Product-3 | 0 | 1 | | Product-4 | 0 | 0 | +-------------+-------+------------+ 4 rows in set (0.12 sec)
Updated on 30-Jul-2019 22:30:25
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