Question

I want get concatenated citycode-hotelcode pair from the cityHotelData Table.
(citycode and hotelcode are varchar in cityHotelData Table)

When I am running following query using phpPgAdmin it works fine.

select citycode || '-' || hotelcode from cityHotelData

But when I am running it in java using JDBC it gives following error.

org.postgresql.util.PSQLException: The column name citycode || '-' || hotelcode was not found in this ResultSet.

I am using PostgreSQL 8.0.26.

Java Code :

Connection conn = DriverManager.getConnection(ConnString,ConnUser,ConnPassword);

public ResultSet executeStatementQuery(String sql) throws Exception {

        this.qry = sql;

        try {
            stmt    = conn.createStatement(); // Statement stmt
            rs      = stmt.executeQuery(sql); //ResultSet rs
        } catch (SQLException sqlEx) {
            sqlEx.printStackTrace();
            closeResultSet();
        } catch (Exception cnfe) {
            closeResultSet();
            cnfe.printStackTrace();
        }
        return rs;
    }

Answer 1

Try this:

SELECT (citycode || '-' || hotelcode) AS cityhotel
FROM cityHotelData

EDIT:
To exclude any Java issues, try using this Java code:

Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(
    "SELECT (citycode || '-' || hotelcode) AS cityhotel FROM cityHotelData"
);
while (rs.next()) {
    System.out.print("City-hotel code: ");
    System.out.println(rs.getString(1));
}
rs.close();
st.close();