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I have simple query in which count of distinct chemist id is retrieved for particular user.


if i write -> count(distinct(chemist_id)) -> it returns= 1 [here chemist_id=0]
if i write -> count(chemist_id) -> it returns= 9 (9 times user add other chemist details(not registered chemist details))

how distinct count=1 if id's are 0

Please tell me how it is possible?
Posted
Comments
choudhary.sumit 11-Dec-12 0:06am
   
post your full query with some table records fro example.
Sweetynewb 11-Dec-12 0:33am
   
Query:

select count(distinct(cb.chemist_name)) as SumChem
from educator_call_dtls ed
left join chem_business_data cb on cb.call_id=ed.call_id
where ed.eid=780 and month(ed.call_date)=11 and year(ed.call_date)=2012

Table:chem_business_data has 9 records:

ID chem_id call_id patient_count other_chemist_name location
46367 0 64866 0 MEDICAL SHOP DEVICE DEMO SALEM
46368 0 64869 0 MEDICAL SHOP DEVICE DEMO SALEM
48741 0 67806 0 MEDICAL SHOP DEVICE DEMO SALEM
48750 0 67812 0 MEDICAL SHOP DEVICE DEMO SALEM
48749 0 67810 0 CANOPY ERODE
49790 0 69546 0 MEDICAL SHOP DEVICE DEMO SALEM
51811 0 71874 0 MEDICAL SHOP DEVICE DEMO SALEM
51867 0 71912 0 MEDICAL SHOP DEVICE DEMO SALEM
51808 0 71869 0 MEDICAL SHOP DEVICE DEMO SALEM

Hi,

Count(chemist_id) - returns count of rows in the table

count(distinct chemist_id) - returns count of distinct (or unique) chemist_id. Which means all rows in the table have same chemist_id.
   
v4
-- For Better Understanding--

Chem_id (0,0,0,0,1,1,1,4,4,4,4,4)
Count(Chem_id)=12
Count(Distinct(Chem_id))=3 ( Here 0,1,4)
   

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