Question

我有一个相对较大的表，有很多列和行。其中我有身份证，经度和纬度。我想要一个具有相同坐标（纬度和经度）的ID列表像这样的东西

ID¦latitude¦longitude¦number

1 ¦   12.12¦    34.54¦1

12¦   12.12¦    34.54¦1

52¦   12.12¦    34.54¦1


3 ¦   56.08¦   -45.87¦1

67¦   56.08¦   -45.87¦1

由于

Answer 1

您可以使用EXISTS查询：

select *
from the_table t1
where exists (select 1
              from the_table t2
              where t1.id <> t2.id
                and (t1.latitude, t1.longitude) = (t2.latitude, t2.longitude))
order by latitude, longitude;

或窗口函数：

select *
from (
    select t.*, 
           count(*) over (partition by latitude, longitude) as cnt
    from the_table t
) t
where cnt > 1
order by latitude, longitude;

在线示例：http://rextester.com/ITKJ70005

Answer 2

简单的解决方案：

SELECT 
    t.id, t.latitude, t.longitude, grp.tot
FROM 
   your_table t INNER JOIN (
        SELECT latitude, longitude, count(*) AS tot
        FROM your_table
        GROUP BY latitude, longitude
        HAVING count(*) > 1
    ) grp ON (t.latitude = grp.latitude AND t.longitude = grp.longitude);

或者获取lat / lng的重复项：

    SELECT
        latitude, longitude, 
        array_agg(id ORDER BY id) AS ids
    FROM
        place
    GROUP BY
        latitude, longitude
    HAVING
        count(*) > 1;

在具有ID＆＃39; s的多个列中查找具有相同值的行

2 个答案: