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you cannot select a column if it is not in group by clause. Therefore you need to group by using the both hackers.hacker_id, name.
select
column
group by
hackers.hacker_id, name
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You are viewing a single comment's thread. Return to all comments →
you cannot
select
acolumn
if it is not ingroup by
clause. Therefore you need togroup by
using the bothhackers.hacker_id, name
.