Mysql query to select a distinct column and the count of a value in another column where column like distinct coumn?

Question

My data table is as below:

ID WEEK   RESULT 
1   13     GOOD
2   13     BAD
3   13     GOOD
4   14     GOOD
5   14     BAD
6   15     BAD

I nee

Answer 1

You can use an aggregate function with a CASE expression to convert the rows into columns:

select week,
  sum(case when result = 'good' then 1 else 0 end) GoodResult,
  sum(case when result = 'bad' then 1 else 0 end) BadResult
from yt
group by week;

See SQL Fiddle with Demo