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drop table persons; create table persons ( id int, name varchar(100), gender varchar(10), location varchar(100)); insert into persons values (1, 'John', 'm', 'Los Angeles'); insert into persons values (2, 'Mike', 'm', 'Seattle'); insert into persons values (3, 'Ann', 'f', 'New York'); insert into persons values (4, 'Emily', 'f', 'Los Angeles'); -- Expected Output /* location | male_count | female_count Los Angeles | 1 | 1 New York | 0 | 1 Seattle. | 1 | 0 */ select location, count(gender) as male_count, count(gender) as female_count from persons where gender = 'm' and group by location; create table user_events (id integer, event_user varchar(20), web_page varchar(20), start_time timestamp ); insert into user_events values (1, 'raj', 'home', to_timestamp('01-NOV-2020 14:01:00', 'dd-mon-yyyy hh24:mi:ss')); insert into user_events values (1, 'raj', 'page 1', to_timestamp('01-NOV-2020 14:02:00', 'dd-mon-yyyy hh24:mi:ss')); insert into user_events values (1, 'raj', 'page 3', to_timestamp('01-NOV-2020 14:05:00', 'dd-mon-yyyy hh24:mi:ss')); insert into user_events values (2, 'kumar', 'page 1', to_timestamp('01-NOV-2020 14:10:00', 'dd-mon-yyyy hh24:mi:ss')); insert into user_events values (2, 'kumar', 'page 2', to_timestamp('01-NOV-2020 14:20:00', 'dd-mon-yyyy hh24:mi:ss')); insert into user_events values (2, 'kumar', 'page 3', to_timestamp('01-NOV-2020 14:40:00', 'dd-mon-yyyy hh24:mi:ss')); select * from user_events;