Question

I am trying to count a distinct value in either of two rows. For instance, a table with columns fruit0, fruit1. I can get a count of the distinct values of either row, but I want a count of them combined (note this is a stupid contrived example).

Example:

id | fruit0 | fruit1
--------------------
0  | apple  | banana
1  | apple  | pear
2  | apple  | apple
3  | pear   | banana

I want something like:

fruit | count   
--------------
apple | 4
banana| 2
pear  | 2

Answer 1

select fruit_name, count(*) 
FROM
(
   SELECT fruit0 as fruit_name
   FROM table1
   UNION ALL
   SELECT fruit1 as fruit_name
   FROM table1
)aaa
GROUP BY fruit_name