在Oracle SQL中获取每一行的计数

Question

Consider below table:

EmpId  EmpType ExpUniId
1       A        234
1       B        453
2       A        454

I want to write a sql query such that I get following data

EmpId  EmpType ExpUniId   Count
1       A        234       2
1       B        453       2
2       A        454       1

Count implies number of rows corresponding to each Emp Id

I am using Oracle Sql.

Thanks

Answer 1

You are looking for the analytic version of count() :

select t.*,
       count(*) over (partition by EmpId) as Count
from table t;