Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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-- Hint: use Ctrl+Enter for SQL autocomplete
create table sales (guest_id int, point int);
insert into sales values
(1, 1), (1, 2), (1, 3),
(2, 2), (2, 3), (2, 4)
;
select point, count(distinct guest_id) as guest_count
from sales
group by point;
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