MySQL - Counting how many rows have a particular value

Working on a SugarCRM dashboard today, and I needed to count how many records had one value and how many records had a second value. I then wanted to know what percentage the first value was of the total. So there’s a bit of MySQL code that helps make this easy to do.

SELECT
SUM(IF(field_name = 'value_one',1,0)) AS 'Value One',
SUM(IF(field_name = 'value_two',1,0)) AS 'Value Two'
FROM table_name

What this does is counts up how many times value_one and value_two appear in field_name in the table table_name.

You can then take this a step further, if you wanted to, and I did… you can use a line like this within your query:

SELECT
SUM(IF(field_name = 'value_one',1,0)) AS 'Value One',
SUM(IF(field_name = 'value_two',1,0)) AS 'Value Two',
ROUND(SUM(IF(field_name = 'value_one',1,0)) / (SUM(IF(field_name = 'value_one',1,0)) + SUM(IF(field_name = 'value_two',1,0))) * 100) AS 'Percentage'
FROM table_name

This gives you the percentage that value_one is of (value_one + value_two).

Hat tip to this stackoverflow answer by eisberg.

Edit: 2014-05-26-21h53m put the final code snippet into a ‘Gist’ on GitHub.

Written on May 15, 2014