SQL distinct for 2 fields in a database
How about simply:
select distinct c1, c2 from t
or
select c1, c2, count(*)
from t
group by c1, c2
If you want distinct values from only two fields, plus return other fields with them, then the other fields must have some kind of aggregation on them (sum, min, max, etc.), and the two columns you want distinct must appear in the group by clause. Otherwise, it's just as Decker says.
You can get result distinct by two columns use below SQL:
SELECT COUNT(*) FROM (SELECT DISTINCT c1, c2 FROM [TableEntity]) TE