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create table holdings ( institution_id int, symbol varchar(32), shares int, quarter varchar(32) ); insert into holdings values (1, 'AAPL', 0, '2020_Q4'), (2, 'TSLA', 200000, '2020_Q4'), (1, 'AAPL', 100000, '2020_Q3'); select * from ( select holdings.*, lead(shares) over (partition by institution_id, symbol order by quarter desc) previous_quarter from holdings where symbol = 'AAPL' ) copmarsion where shares < coalesce(previous_quarter, 0);
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