How to check for mutiple rows with same data?
DISTINCT will combine identical rows.  GROUP BY will combine them and allow you to know which ones had multiples using COUNT(*).  To meet your "not select data of multiple rows" requirement you will need to add a HAVING clause.  Your query will look something like this:

SELECT cola, colb, colc FROM T1 GROUP BY cola, colb, colc HAVING count(*) = 1;


SQL Fiddle Demonstration