Hi Siddhartha,
As Krishna mentioned, you can use distinct in your case.
SELECT DISTINCT "Company_Name" FROM "Schema"."Table";
This should work fine to delete duplicates.
If your combining two datasets, you can use UNION or UNION ALL
UNION - return only distinct values i.e remove duplicates
UNION ALL - will give you all the info with duplicates.
Regards
Avinash Raju