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我想分组和检索通过数据字段连接的两个表中的数据。产量是两个表中的年份和月份。 当我与另一个表“purch_ret_hd”进行连接时,结果对列Purchase_Return不正确。请建议,如果事情是错误的查询MS SQL与日期字段上的两个表分组
Select YEAR(grn_hd.grn_date) AS GRN_Date,
DATENAME(MONTH,grn_hd.grn_date) AS Month_Name,
Month(grn_hd.grn_date) AS Month,
SUM(grn_hd.inv_amt) AS Purchase_Gross,
SUM(grn_hd.disc_amt) AS Purchase_discount,
SUM(grn_hd.inv_amt) - SUM(grn_hd.disc_amt) AS
Purchase_After_Discount,
sum(grn_hd.net_amt) AS Purchase_Net,
SUM(purch_ret_hd.net_amt) AS Purchase_Return
FROM grn_hd
LEFT JOIN purch_ret_hd
ON YEAR(purch_ret_hd.entry_date) = YEAR(grn_hd.grn_date) AND
Month(purch_ret_hd.entry_date) = Month(grn_hd.grn_date)
AND purch_ret_hd.loc_id = grn_hd.loc_id
AND purch_ret_hd.loc_id = grn_hd.loc_id
GROUP BY
YEAR(grn_hd.grn_date),Month(grn_hd.grn_date),
DATENAME(MONTH,grn_hd.grn_date)
Order by 1,3
1.请详细解释'不正确'; 2.请修改查询以使其有效 –