public static boolean porovnaj(String dopyt1, String dopyt2) throws SQLException {
        try(Connection c = DriverManager.getConnection("jdbc:postgresql://db.dai.fmph.uniba.sk/playground", "gajdosech2@uniba.sk", "datakyseliny")) {
            try(Statement s1 = c.createStatement()) {
                try(Statement s2 = c.createStatement()) {
                    ResultSet r1 = s1.executeQuery(dopyt1);
                    ResultSet r2 = s2.executeQuery(dopyt2);
                    if (r1.next() != r2.next()) return false;
                    ResultSetMetaData metaData1 = r1.getMetaData();
                    ResultSetMetaData metaData2 = r2.getMetaData();
                    if (metaData1.getColumnCount() != metaData2.getColumnCount()) return false;
                    for (int i = 1; i <= metaData1.getColumnCount(); ++i) {
                        String nazovStlpca1 = metaData1.getColumnName(i);
                        String nazovStlpca2 = metaData2.getColumnName(i);
                        if (nazovStlpca1.equals(nazovStlpca2) == false) return false;
                    }
                    while (r1.next()) { //prechadzam riadky
                        if (r2.next() == false) return false;
                        /*
                        for (int i = 1; i <= metaData1.getColumnCount(); ++i) {
                            if (r1.getObject(i) != r2.getObject(i)) return false;
                        }
                        */
                    }
                    if (r2.next() == true) return false;
                }
            }
        }
        return true;
    }