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drop table brands; create table brands ( Year int, Brand varchar(20), Amount int ); insert into brands values (2018, 'Apple', 45000); insert into brands values (2019, 'Apple', 35000); insert into brands values (2020, 'Apple', 75000); insert into brands values (2018, 'Samsung', 15000); insert into brands values (2019, 'Samsung', 20000); insert into brands values (2020, 'Samsung', 25000); insert into brands values (2018, 'Nokia', 21000); insert into brands values (2019, 'Nokia', 17000); insert into brands values (2020, 'Nokia', 14000); select * from brands; with cte as ( select *,lag(amount,1,amount-1) over(partition by brand order by year) as lag_amount from brands ) select * from cte

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