oracle基于单个列重复行

时间:2013-04-30 02:03:17

标签: sql oracle11g duplicates

如何根据单个列找出重复的行。我在oracle中有一个表,其中包含下面给出的数据,它有重复数据。我正在尝试选择并查看具有重复员工ID的所有行,如下所述

EMP表:

EmpId Fname Lname Mname Jobcode Status exp_date

1      Mike Jordan A    IT      W      12/2014
1      Mike Jordan A    IT      A      12/2014
2      Angela ruth C    sales   P      12/2015
2      Angela ruth C    IT      W      12/2015
3      Kelly  Mike B    sales   W      12/2015

从上表中我想选择所有复制empid的行,如下面的

EmpId Fname Lname Mname Jobcode Status exp_date

1      Mike Jordan A    IT      W      12/2014
1      Mike Jordan A    IT      A      12/2014
2      Angela ruth C    sales   P      12/2015
2      Angela ruth C    IT      W      12/2015

我该怎么做?谢谢!

2 个答案:

答案 0 :(得分:6)

SELECT  a.*
FROM    TableName a
        INNER JOIN
        (
            SELECT  EmpID
            FROM    TableName
            GROUP   BY EmpID
            HAVING  COUNT(*) > 1
        ) b ON a.EmpID = b.EmpID

另一种方式,虽然我更喜欢,但是使用IN

SELECT  a.*
FROM    TableName a
WHERE   EmpId IN
        (
            SELECT  EmpId
            FROM    TableName
            GROUP   BY EmpId
            HAVING  COUNT(*) > 1
        ) 

答案 1 :(得分:2)

以下是使用子查询和COUNT OVER PARTITION BY的另一个选项,因为您使用的是Oracle 11:

SELECT * 
FROM (
  SELECT EmpId, Fname, Lname, Mname, Jobcode, Status, exp_date,
    COUNT(EmpId) OVER (PARTITION BY EmpId) EmpCount
  FROM    TableName 
  ) T
WHERE EmpCount > 1

SQL Fiddle Demo(从JW借来)