Postgresql/PostGIS，在计算列上排序时，计算运行总数，直到达到一定数量

我有一个查询，非常类似于在达到某个值之前创建一个运行总数的查询。在我的例子中，我正在计算各县的人口，直到达到所需的人口

但是，我想按距离lng/lat的距离排序搜索，以便首先添加距离最近的县。我正在下面运行此查询，但未得到任何结果。当我改为按行id排序或任何非空间计算的列时，它会返回结果。我也尝试过使用两个带有子句的

，但仍然没有结果。我尝试将
distance
转换为整数，因为它可能没有正确键入，但没有帮助

我已经设置了一个测试服务器，您可以在其中使用该端点运行查询
http://sqltestmcr.cartodb.com/api/v2/sql?q=

这就是我正在尝试的问题。下面是一些有效的变体。
您可以通过以下链接查看此查询的结果：
http://sqltestmcr.cartodb.com/api/v2/sql?q=SELECT%20*%20FROM%20（%20SELECT%20Country、%20the_geom、%20distance、%20row_id_2、%20um（人口）%20FROM%20（订单%20by%20distance%20asc）%20as%20running_total%20FROM%20（%20SELECT%20row_id、%20Country、%20人口、%20the_geom、%20row_id%20*%202%20as%20row_id_2、%20Stum距离（%20Stud_质心（地理），%20ST\u geomefromtext（'POINT（-72.1235%2042.3521）“%204326）%20）%20AS%20distance%20FROM%20countries\u ny\u export）%20sq1）%20sq2%20其中%20running\u总计%20%3C=%201400

    SELECT
    *
    FROM (
        SELECT 
        county,
        the_geom,
        distance,
        row_id_2,
        sum(population) over (order by distance asc) as running_total
      FROM (
        SELECT 
        row_id,
        county, 
        population,
        the_geom,
        row_id * 2 AS row_id_2,
        ST_Distance(
          ST_Centroid(the_geom), 
          ST_GeomFromText('POINT(-72.1235 42.3521)', 4326)
        ) AS distance 
        FROM
        counties_ny_export
    ) sq1
    ) sq2   
    where running_total <= 1400

    SELECT
    *
    FROM (
        SELECT 
        county,
        the_geom,
        distance,
        row_id_2,
        sum(population) over (order by row_id asc) as running_total
      FROM (
        SELECT 
        row_id,
        county, 
        population,
        the_geom,
        row_id * 2 AS row_id_2,
        ST_Distance(
          ST_Centroid(the_geom), 
          ST_GeomFromText('POINT(-72.1235 42.3521)', 4326)
        ) AS distance 
        FROM
        counties_ny_export
    ) sq1
    ) sq2   
    where running_total <= 1400

带有
行id\u 2的测试链接
：
http://sqltestmcr.cartodb.com/api/v2/sql?q=SELECT%20*%20FROM%20（%20SELECT%20county、%20the_geom、%20distance、%20row_id_2、%20um（人口）%20FROM%20（订单%20by%20row_id_2%20asc）%20as%20running_total%20FROM%20（%20SELECT%20row_id、%20Country、%20People、%20the_geom、%20row_id%20*%20*%202%20as%20row_id_质心（%20ST geom），%20ST\u GeomFromText（'POINT（-72.1235%2042.3521）“%204326）%20）%20AS%20distance%20FROM%20countries\u ny\u export）%20sq1）%20sq2%20其中%20running\u total%20%3C=%201400
一切正常，恰好距离查询点最近的县人口为1700，因此超过了运行总截止值

    SELECT
    *
    FROM (
        SELECT 
        county,
        the_geom,
        distance,
        row_id_2,
        sum(population) over (order by distance asc) as running_total
      FROM (
        SELECT 
        row_id,
        county, 
        population,
        the_geom,
        row_id * 2 AS row_id_2,
        ST_Distance(
          ST_Centroid(the_geom), 
          ST_GeomFromText('POINT(-72.1235 42.3521)', 4326)
        ) AS distance 
        FROM
        counties_ny_export
    ) sq1
    ) sq2   
    where running_total <= 1400

    SELECT
    *
    FROM (
        SELECT 
        county,
        the_geom,
        distance,
        row_id_2,
        sum(population) over (order by row_id asc) as running_total
      FROM (
        SELECT 
        row_id,
        county, 
        population,
        the_geom,
        row_id * 2 AS row_id_2,
        ST_Distance(
          ST_Centroid(the_geom), 
          ST_GeomFromText('POINT(-72.1235 42.3521)', 4326)
        ) AS distance 
        FROM
        counties_ny_export
    ) sq1
    ) sq2   
    where running_total <= 1400

将运行总截止值提高到5000（）将选择两行：

{'fields': {'county': {'type': 'string'},
            'distance': {'type': 'number'},
            'population': {'type': 'number'},
            'row_id_2': {'type': 'number'},
            'running_total': {'type': 'number'}},
 'rows': [{'county': 'Rensselaer',
           'distance': 1.4299124873995,
           'population': 1700,
           'row_id_2': 34,
           'running_total': 1700},
          {'county': 'Columbia',
           'distance': 1.51173290729954,
           'population': 2200,
           'row_id_2': 44,
           'running_total': 3900}],
 'time': 0.002,
 'total_rows': 2}

类似地，如果您有一个与小于1400的县最近的不同查询点，则应返回1行或多行。
如果您可以提供一些示例，则解决问题会容易得多SQL Fiddle没有PostGIS功能，而且PostGIS似乎是一个问题，非空间计算的列值有效。相反，我创建了一个测试数据库，您可以通过上面的端点进行查询。您可以使用
http://sqltestmcr.cartodb.com/api/v2/sql?q=SELECT *从纽约州出口
。查询不需要URI编码。