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CREATE TABLE mytable( date DATE NOT NULL PRIMARY KEY ,buy_sell VARCHAR(4) NOT NULL ,quantity INTEGER NOT NULL ,Rolling_Sum INTEGER ); INSERT INTO mytable(date,buy_sell,quantity,Rolling_Sum) VALUES ('2019-08-08','BUY',100,NULL); INSERT INTO mytable(date,buy_sell,quantity,Rolling_Sum) VALUES ('2019-09-13','SELL',-100,0); INSERT INTO mytable(date,buy_sell,quantity,Rolling_Sum) VALUES ('2019-09-26','BUY',200,200); INSERT INTO mytable(date,buy_sell,quantity,Rolling_Sum) VALUES ('2019-09-28','SELL',-50,150); INSERT INTO mytable(date,buy_sell,quantity,Rolling_Sum) VALUES ('2019-09-29','SELL',-150,0);
select max(date) from mytable t where buy_sell = 'BUY' and date < ( select max(date) from mytable where rolling_sum = 0 and buy_sell = 'SELL' )
max(date)
2019-09-26