Question

希望有人可以提供帮助。

我有两个mysql select语句，每个语句都有效，但我现在需要将它们组合起来。

首先：

SELECT $shares.*, $shares_company.name AS name, SUM($shares.number) AS totalNumber, MAX(date) AS lastTransDate, $shares.timestamp AS lastUpdated FROM $shares 
INNER JOIN
$shares_company WHERE $shares_company.id = $shares.company_id GROUP   BY $shares.company_id

第二名：

SELECT $shares.price AS lastPrice 
FROM $shares WHERE ($shares.company_id,$shares.date) IN 
(SELECT $shares.company_id, MAX($shares.date) FROM $shares GROUP BY $shares.company_id)

我尝试了UNION和UNION ALL以及各种其他组合。

我被困住了！

enter image description here

更新

嗯，那是我现在的距离。这将返回所有正确的信息，除了我需要获取“数字”列的总和，我不知道将其插入查询的位置。要插入的查询是：

SELECT
SUM($shares.number) AS totalNumber FROM $shares 
GROUP BY $shares.company_id

我现在的查询是：

SELECT $shares.price AS lastPrice,
$shares.date AS lastTransDate, 
$shares.company_id,
$shares.id,
$shares.timestamp AS lastUpdated,
$shares_company.name
FROM $shares 

INNER JOIN $shares_company
ON $shares_company.id = $shares.company_id

WHERE ($shares.company_id,$shares.date) IN 
(SELECT $shares.company_id, MAX($shares.date)
FROM $shares
GROUP BY $shares.company_id)

感谢您的帮助。

Answer 1

如果我理解正确，您需要在第一个查询中使用lastPrice结果。在这种情况下，我尝试这样的事情：

SELECT
  $shares.*,
  $shares_company.name AS name,
  SUM($shares.number) AS totalNumber,
  MAX(date) AS lastTransDate,
  $shares.timestamp AS lastUpdated FROM $shares,
  ( SELECT $s.price
    FROM $shares AS $s
    WHERE $s.company_id = $shares.company_id
    ORDER BY $s.date DESC
    LIMIT 1
  ) AS lastPrice
  INNER JOIN $shares_company
    ON $shares_company.id = $shares.company_id
GROUP BY $shares.company_id

（注意：这是未经测试的，但原因应该是明确的：创建内部查询以选择此给定行的最后一个股价，然后将其作为另一列返回。）

将两个select语句与GROUP和JOIN mysql

1 个答案: