sql - How to select the sum of distinct values in a table using mysql - 


slno state district company 1 ab abc 2 ab ac 3 ab abc 4 ab abc 5 ab abc 6 ab ac

output

state district company sumzz ab abc 4 ab ac 2

what have tried 

select state,district,company,sum(company) sumzz company

how achieve display last row based on distinct company?

and what's wrong approach:

 select state, district, company, count(*) countzz company group state, district, company

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