Question

This is my table “rating” in my database.

attraction      customer      rate
------------------------------------
attrac1         cust1         like
attrac2         cust1         dislike 
attrac1         cust2         like

What SQL should i write to make the output become like this

attraction      like       dislike
----------------------------------
attrac1           2           0
attrac2           0           1

I tried this

SELECT a_id,
(SELECT COUNT(rate) FROM rating WHERE rate = 'like') as 'Like',
(SELECT COUNT(rate) FROM rating WHERE rate = 'dislike') as 'Dislike'
FROM rating

But I cant get the result that I want.

Answer 1

This is one approach:

SELECT a_id,
    SUM(Case when rate='like' then 1 else 0 end) as 'Like',
    SUM(Case when rate='dislike' then 1 else 0 end) as 'Dislike'
FROM rating
Group BY A_id