Question

我不太确定如何扩展此查询以便我也可以拥有AVG(price_current)列...而不必在查询返回后在PHP中计算此值。

SELECT
  listing_subtype, bedrooms, total_baths, tot_sqft_finished, price_current, latitude, longitude, (
    3959 * acos (
      cos ( radians(48.639) )
      * cos( radians( latitude ) )
      * cos( radians( longitude ) - radians(-123.404) )
      + sin ( radians(48.639) )
      * sin( radians( latitude ) )
    )
  ) AS distance
FROM rets_property_resi
WHERE listing_subtype = 'Single Family Detached' AND
bedrooms >= 2 AND bedrooms <= 3 AND
total_baths >= 1 AND total_baths <= 2 AND
tot_sqft_finished >= 2000 AND tot_sqft_finished <= 2500
HAVING distance < 5
ORDER BY distance
LIMIT 0, 25;

Answer 1

我将在这里做一些假设：

您在要求的半径范围内寻找类似的房屋/住宅。每个家庭都有一个您要查询的表中的主键。我们在这里打电话给primKey。

此外，您希望所有归还房屋的平均价格限制为0.25，而不是表格中与您WHERE条款匹配的所有记录的AVG。

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因此，所有返回的行都将包含一个额外字段，其中包含平均价格，并且每行都相同。

您必须再次作为子查询运行相同的查询。但是，由于您要限制AVG，您必须在子查询中运行它以计算正确的AVG。这真是笨重：

SELECT
  rets_property_resi.listing_subtype, rets_property_resi.bedrooms, rets_property_resi.total_baths, rets_property_resi.tot_sqft_finished, rets_property_resi.price_current, rets_property_resi.latitude, rets_property_resi.longitude, (
    3959 * acos (
      cos ( radians(48.639) )
      * cos( radians( latitude ) )
      * cos( radians( longitude ) - radians(-123.404) )
      + sin ( radians(48.639) )
      * sin( radians( latitude ) )
    )
  ) AS distance, outerSubQuery.averagePrice
FROM rets_property_resi
LEFT JOIN
(
    SELECT innerSubQuery.primKey AS primKey, AVG(innerSubQuery.price_current) AS averagePrice
    FROM
        (SELECT
          primKey, price_current, (
            3959 * acos (
              cos ( radians(48.639) )
              * cos( radians( latitude ) )
              * cos( radians( longitude ) - radians(-123.404) )
              + sin ( radians(48.639) )
              * sin( radians( latitude ) )
            )
          ) AS distance
        FROM rets_property_resi
        WHERE listing_subtype = 'Single Family Detached' AND
        bedrooms >= 2 AND bedrooms <= 3 AND
        total_baths >= 1 AND total_baths <= 2 AND
        tot_sqft_finished >= 2000 AND tot_sqft_finished <= 2500
        HAVING distance < 5
        ORDER BY distance
        LIMIT 0, 25) AS innerSubQuery
    GROUP BY innerSubQuery.primKey
) AS outerSubQuery ON (outerSubQuery.primKey = rets_property_resi.primKey)

WHERE listing_subtype = 'Single Family Detached' AND
bedrooms >= 2 AND bedrooms <= 3 AND
total_baths >= 1 AND total_baths <= 2 AND
tot_sqft_finished >= 2000 AND tot_sqft_finished <= 2500
HAVING distance < 5
ORDER BY distance
LIMIT 0, 25;

我打赌有一个更优雅的版本。你最好在这里使用临时表，或者只是在代码中计算。

SELECT列还要添加AVG列

1 个答案: