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Getting count of two different sets of rows in a table and then dividing them in MySQL
For this, use count(*) and the divide the count of two different sets of rows. Let us first create a table −
mysql> create table DemoTable(isMarried tinyint(1)); Query OK, 0 rows affected (0.53 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.17 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+ | isMarried | +-----------+ | 1 | | 0 | | 1 | | 1 | | 1 | +-----------+ 5 rows in set (0.00 sec)
Following is the query to get the count of two different sets of rows in a table and then dividing them −
mysql> select ( select count(*) from DemoTable where isMarried=1) / ( select count(*) from DemoTable where isMarried=0 ) AS divide from dual;
This will produce the following output −
+--------+ | divide | +--------+ | 4.0000 | +--------+ 1 row in set (0.00 sec)
Updated on: 22-Aug-2019
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