通过T-SQL从表数据中查询数据

Question

I want to extract data from the Account_Transaction table for accounts with more than two credits in the last 4 months. I have included sample data along with a SQL query I have tried, but does not provide the data I want:

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   

but this seems doesn't fetch the desired output

Answer 1

This should work...

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

This will sum up the credit_amount and show the last effective_date .

If you want to list the records for the account that meets the above criteria, you could use a 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