通过T-SQL

Question

我想从Account_Transaction表中提取过去4个月中超过两个学分的帐户的数据。我已经包含了示例数据以及我尝试过的SQL查询，但是没有提供我想要的数据：

SELECT DISTINCT
        account_id
       ,transaction_type_id
       ,credit_amount
       ,effective_date
FROM    Account_Transaction
WHERE   transaction_type_id = 1
        AND effective_date BETWEEN '01 feb 2015'
                           AND     '01 may 2015'
GROUP BY account_id
HAVING  COUNT(account_id) > 2
ORDER BY account_id   

但这似乎无法获取所需的输出

Answer 1

这应该有用......

SELECT DISTINCT
        account_id
       ,transaction_type_id
       ,SUM(credit_amount)
       ,MAX(effective_date)
FROM    Account_Transaction
WHERE   transaction_type_id = 1
        AND effective_date BETWEEN '01 feb 2015'
                           AND     '01 may 2015'
GROUP BY account_id, transaction_type_id
HAVING  COUNT(account_id) > 2
ORDER BY account_id

这将总结 credit_amount 并显示最后的 effective_date 。

如果您要列出符合上述条件的帐户的记录，您可以使用CTE ......

--the cte will give a list of Account ID's with the criteria
WITH cteAccounts AS (
      SELECT DISTINCT
            account_id
    FROM    Account_Transaction
    WHERE   transaction_type_id = 1
            AND effective_date BETWEEN '01 feb 2015'
                               AND     '01 may 2015'
    GROUP BY account_id
    HAVING  COUNT(account_id) > 2
)

--join against the CTE to get the accounts Id's
SELECT a.account_id
       ,a.transaction_type_id
       ,a.credit_amount
       ,a.effective_date
FROM    Account_Transaction a INNER JOIN cteAccounts b on a.account_id = b.account_id
WHERE   a.transaction_type_id = 1
        AND a.effective_date BETWEEN '01 feb 2015'
                           AND     '01 may 2015'
ORDER BY account_id