oracle 查询表中字段里数据是不是有重复

oracle 查询表中字段里数据是否有重复

?查单个字段：

SELECT TEST_NAME,COUNT(*) FROM T_TEST GROUP BY TEST_NAME HAVING COUNT(*) > 1

?查组合字段：

SELECT TEST_NAME1,TEST_NAME2,COUNT(*) FROM T_TEST GROUP BY TEST_NAME1,TEST_NAME2 HAVING COUNT(*) > 1

?

?

?

?