使用计数选择最小值和最大值

Question

I have a table called 'Medical Report' I need to select min date,max date in prescriptionwritten and corresponding active status for particular account number,code

Accountnumber code   prescriptionwritten.  Active      
101            201          2019-10-21         0          
101            201          2020-03-24         0     
101            201          2020-05-25         1     
101            202          2019-10-21         0     
101            202          2020-06-20         1

Please help with sql query.

The output:

101 201 2019-10-21 0  
101 201 2020-05-25 1  
101 202 2019-10-21 0  
101 202 2020-06-20 1

Answer 1

You can try using row_number()

select * from
(
select *,row_number() over(partition by code order by prescriptionwritten) as minrn,
row_number() over(partition by code order by prescriptionwritten desc) as maxrn
from tablename
)A where minrn=1 or maxrn=1