How to find duplicate row in sql query?

Hi All,
Please solve my query, find duplicate row and how to count its. your suggestion would be greatly appreciated.

You can use group by and having.
SQL> WITH t
2       AS (SELECT       LEVEL id
3                 FROM   DUAL
4           CONNECT BY   LEVEL <= 5
5           UNION ALL
6           SELECT       LEVEL + 2
7                 FROM   DUAL
8           CONNECT BY   LEVEL <= 3)
9 SELECT   *
10    FROM   t;
        ID
         1
         2
         3
         4
         5
         3
         4
         5
8 rows selected.
SQL> WITH t
2       AS (SELECT       LEVEL id
3                 FROM   DUAL
4           CONNECT BY   LEVEL <= 5
5           UNION ALL
6           SELECT       LEVEL + 2
7                 FROM   DUAL
8           CONNECT BY   LEVEL <= 3)
9 SELECT     id, COUNT (*)
10      FROM   t
11 GROUP BY   id
12    HAVING   COUNT (*) > 1;
        ID   COUNT(*)
         3          2
         4          2
         5          2
SQL>

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