title: Generate unique ID to append records in PostgreSQL
body: <p>I am using one postgreSql query which populates one table with some values and it takes different parameter when i run. I am appending rows each times i run the query with different parameter, Now i am interested in giving one auto generated ID to all rows which are coming as an output for one set of parameter.. So that I can access those rows which belong to certain parameters. </p>
  
  <p>Can anyone help me how to append rows each time with one unique ID column?</p>