sql - MySql 计数查询

Question

我正在为一份一次性报告处理这个查询。基本上我想做的是找到上个月单个帐户 ID 超过两笔交易的所有记录。我知道这可能很简单，我的脑子一片空白。

SELECT streaming_transactions.account_id,
   streaming_transactions_detail.transactions_description, 
   streaming_transactions_detail.transactions_detail_id, 
   streaming_transactions_detail.transactions_id, 
   streaming_transactions_detail.transactions_detail_amount, 
   streaming_transactions_detail.detail_type, 
   streaming_transactions_detail.products_id, 
   streaming_transactions_detail.products_levels_id, 
   streaming_transactions_detail.subscriptions_id, 
   streaming_transactions_detail.subscriptions_payment_options_id, 
   streaming_transactions_detail.modified
  FROM streaming_transactions_detail 
INNER JOIN streaming_transactions ON  streaming_transactions_detail.transactions_id = streaming_transactions.transactions_id
WHERE streaming_transactions.charged = 1 
  AND streaming_transactions.timestamp_inserted > '2009-09-01 00:00:00'
  AND streaming_transactions.account_id IN (
                 SELECT account_id
                       FROM streaming_transactions_detail
                      WHERE modified > '2009-09-01 00:00:00'
                        AND count(account_id) > 1)
AND streaming_transactions_detail.transactions_description LIKE '%Service Subscription%'
ORDER BY streaming_transactions.account_id DESC

Answer 1

我想你快到了。 但是，获取事务 ID 的子查询已关闭

         SELECT account_id
              FROM streaming_transactions_detail
              WHERE modified > '2009-09-01 00:00:00'
              AND count(account_id) > 1)

-- 应该是这样的

         SELECT account_id, COUNT(account_id)
             FROM streaming_transactions_detail
             WHERE modified > '2009-09-01 00:00:00'
             GROUP BY account_id
             HAVING count(account_id) > 1)

[无关] 我会主动提出一个关于风格的提示。
通过使用表别名，可以提高查询的可读性。这可以通过选择性地添加“AS xyz”来完成，其中 xyz 是一些简短但助记的名称，对于此查询是唯一的，您可以在查询中使用 long_named_table 的任何地方使用 xyz。
例如:

FROM streaming_transactions_detail AS D

然后

SELECT streaming_transactions.account_id,
   streaming_transactions_detail.transactions_description, 
   streaming_transactions_detail.transactions_detail_id, 
   ...

可以变成(可选，即“streaming_transactions_detail”。仍然有效)

SELECT D.account_id,
   D.transactions_description, 
   D.transactions_detail_id, 
   ...