Question

select station_id,count(case_id) from emer_complaint group by station_id

Above query returning the correct result. But, when i’m trying this query for showing the record in year wise. Then it shows the error ORA-00904: "YEAR": invalid identifier

select year(date_time)
      ,count(case_id) 
 from emer_complaint  
group by year(date_time);

the datatype of date_time is Timestamp.

Thanks in advance.!!

Answer 1

select to_char(date_time, 'YYYY'), count(case_id)
from   emer_complaint
group by to_char(date_time, 'YYYY');