我有查询表：
SELECT DATENAME(Month,TOPUP.tu_timestamp) AS MonthName, TM.terminal_name,
CAST(ROUND(ISNULL(TOPUP.tu_credit - NC.initial_bal, TOPUP.tu_credit) /
TOPUP.currency_rate, 2) AS decimal(18, 2)) AS
Top_Up_Value
FROM dbfastshosted.dbo.fh_mf_top_up_logs AS TOPUP
INNER JOIN dbo.cdf_terminal_user AS TU ON TOPUP.terminal_user_id =
TU.terminal_user_id
INNER JOIN dbo.cdf_currency AS CR ON TOPUP.currency_id = CR.currency_id
INNER JOIN dbo.cdf_cuid AS CU ON TOPUP.cu_id = CU.cu_id
INNER JOIN dbo.cdf_card_role AS CO ON CO.id = CU.card_role_id
INNER JOIN dbo.cdf_terminal_user_account AS UA ON UA.terminal_user_id =
TU.terminal_user_id
INNER JOIN dbo.cdf_terminal AS TM ON TM.terminal_id = UA.terminal_id
INNER JOIN dbfastshosted.dbo.fh_sales_map AS MA ON MA.tu_log_id =
TOPUP.tu_log_id
LEFT OUTER JOIN dbfastshosted.dbo.fh_mf_new_card_logs AS NC ON
MA.nc_log_id = NC.nc_log_id
WHERE (ISNULL(TOPUP.tu_credit - NC.initial_bal, TOPUP.tu_credit) > 0)
and YEAR(TOPUP.tu_timestamp) = '2017'
AND month(TOPUP.tu_timestamp) = 1
AND TM.terminal_id = 7
GROUP BY TOPUP.tu_log_id,DATENAME(Month,TOPUP.tu_timestamp),
TM.terminal_name,
TOPUP.tu_credit, NC.initial_bal, TOPUP.currency_rate, CU.card_type_id;
MonthName Terminal name Top Up Value
------------------------------------------------------
January Terminal 1 100
January Terminal 1 200
January Terminal 3 150
Feb Terminal 1 250
Feb Terminal 1 160
March Terminal 2 120
March Terminal 3 100
我想根据月份的总金额进行充值，如下所示：
MonthName Top Up Value
-----------------------------------
January 450
February 410
March 220
-----
Dec
由于我是 sql 初学者，我不知道该怎么做。在这些方面确实需要帮助。谢谢！
SELECT DATENAME(Month,TOPUP.tu_timestamp) AS MonthName,
SUM(CAST(ROUND(ISNULL(TOPUP.tu_credit - NC.initial_bal, TOPUP.tu_credit) /
TOPUP.currency_rate, 2) AS decimal(18, 2))) AS
Top_Up_Value
FROM dbfastshosted.dbo.fh_mf_top_up_logs AS TOPUP
INNER JOIN dbo.cdf_terminal_user AS TU ON TOPUP.terminal_user_id =
TU.terminal_user_id
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我来说两句