oracle查询表中字段里数据是否有重复
查单个字段：
Sql代码 SELECT TEST_NAME,COUNT(*) FROM T_TEST GROUP BY TEST_NAME HAVING COUNT(*) > 1
查组合字段：
Sql代码 SELECT TEST_NAME1,TEST_NAME2,COUNT(*) FROM T_TEST GROUP BY TEST_NAME1,TEST_NAME2 HAVING COUNT(*) > 1