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我想分組和檢索通過數據字段連接的兩個表中的數據。產量是兩個表中的年份和月份。 當我與另一個表「purch_ret_hd」進行連接時,結果對列Purchase_Return不正確。請建議,如果事情是錯誤的查詢MS SQL與日期字段上的兩個表分組
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.請詳細解釋'不正確'; 2.請修改查詢以使其有效 –