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create table my_data ( user_id varchar(5), some_date date ); insert into my_data values ('A', '2022-08-05'), ('A', '2021-08-05'), ('A', '2020-08-06'), ('B', '2022-08-05'), ('B', '2020-07-07');
5 rows affected
select user_id, total_rows as total, case when total_rows = max_minus_min then 'Y' else 'N' end as Sequential from ( select user_id, year(max(some_date)) - year(min(some_date)) + 1 as max_minus_min, count(*) as total_rows from my_data group by user_id )z order by 1;
user_id
total
Sequential
A
3
Y
B
2
N