Question

I have a table like this

gems
----------
id, color
1 , green
2 , green
3 , blue
4 , red
5 , red
6 , red
7 , rainbow  <<<<< OMNI COLOR
8 , rainbow  <<<<< OMNI COLOR

And I’m trying to get results like this

color count,   each rainbow is added to each color
---------------
color , count
green , 4
blue , 3
red , 5

I’ve been trying various combinations of joins and group bys but i’m not sure how to approach this. In this example each normal color should only be counted once, but each rainbow gem needs to be counted multiple times, and in the real problem there are an X amount of distinct ‘colors’

Answer 1

SELECT `color`, (count(*) + rb.`cnt`) AS `count`
FROM gems,
     (SELECT COUNT(*) AS `cnt` FROM gems WHERE color='rainbow') AS rb
GROUP BY `color`
HAVING `color`<>'rainbow'

Here is a fiddle to show the query working.