Question : Count Distinct

Hi Guys i am trying to count distinct id, i am using this SQL statement
SELECT TissueLocation.MaxOfLocation, Count(DISTINCT TissueLocation.PatientID) AS CountOfPatientID
FROM TissueLocation
GROUP BY TissueLocation.MaxOfLocation;

I having an error
 
Syntax error (missing operator )in query expression 'COUNT(DISTINCT TissueLocation.PatientID)'
in query expression . (Error 3075)

The expression you typed is not valid for the reason indicated in the message. Make sure you have typed field names and punctuation correctly, and then try the operation again.

How can i fix this

Thanks

Answer : Count Distinct

Count(DISTINCT .... is not supported in Access SQL.

Maybe something like this:

SELECT Table1.F1, Count(Table1.F2) AS CountOfF2
FROM Table1
GROUP BY Table1.F1;

mx