Counting unique values SQL

[ppataki]

Dear All,

I have a query that should count unique values only but it does not work:

SELECT Count(*) AS Expr1
FROM [SELECT DISTINCT T1.[field1] FROM [table1] AS T1]. AS T1;

if I replace field1 and table1 with my table and field I get an
invalid bracketing error message

Could you please advise?
Many thanks

 

[Brianwarnock]

SELECT Count(*) AS Expr1
FROM (SELECT DISTINCT T1.[field1] FROM [table1] AS T1) AS T1;

Brian

 

[ppataki]

Thank you very much it works fine!!