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create table stream(company_id int , product varchar(5) , user_tag varchar(5) , count int); insert into stream values(123,'P1','T1',15),(123,'P1','T2',10),(123,'P1','T3',10);
3 rows affected
select company_id,product , string_agg(user_tag,',') , sum(count) from stream group by company_id,product;
company_id
product
string_agg
sum
123
P1
T1,T2,T3
35