How to compare two records of table

Question

Hi all,
How to compare new record with all existing records in table.
In my application i have status column ,which contains the information about
the record is new or old record .
thank you

Answer 1

/*does record 1 have friend*/
WITH t AS
(SELECT 1 AS Id, 'a' AS NAME, 'type1' AS Col
  FROM Dual
  UNION ALL
  SELECT 2 AS Id, 'a' AS NAME, 'type1' AS Col
  FROM Dual
  UNION ALL
  SELECT 3 AS Id, 'a' AS NAME, 'type2' AS Col FROM Dual)
SELECT count(*) as YesNo
FROM t T1
WHERE T1.Id = 1
      AND (T1.Name, T1.Col) IN (SELECT T2.Name, T2.Col FROM T t2 where t2.ID != T1.Id);
     1
/*does record 3 have friend*/
WITH t AS
(SELECT 1 AS Id, 'a' AS NAME, 'type1' AS Col
  FROM Dual
  UNION ALL
  SELECT 2 AS Id, 'a' AS NAME, 'type1' AS Col
  FROM Dual
  UNION ALL
  SELECT 3 AS Id, 'a' AS NAME, 'type2' AS Col FROM Dual)
SELECT count(*) as YesNo
FROM t T1
WHERE T1.Id = 3
   AND (T1.Name, T1.Col) IN (SELECT T2.Name, T2.Col FROM T t2 where t2.ID != T1.Id);
     0
*/