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kurs:case_group_by
select alt, count(alt) from (
select ((case when hire_date > (sysdate - to_yminterval('12-0')) then 'Neuling'  
             when hire_date > (sysdate - to_yminterval('15-0')) then 'Mittelding' 
                                                                else 'Alter Sack' end)) alt
from employees)
group by alt
kurs/case_group_by.txt · Last modified: 2014/09/10 21:22 (external edit)