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The following query is working as expected.
select month, day, count(*) as cnt from publicdata:samples.natality
group by month,day
order by cnt desc;
But as soon as I add where year > 1990
I get only partial results. All the results match with the day = 0 but other days (1 to 31) are not listed in the results.
Is the query correct?
I will also like to know if I am paying for sample public data or it is free.
Actually seems like all data after 1989 have no other days than days set to 0 so the result you get is correct.