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通過查看其他示例無法連接點。在寫這篇文章的時候尋找一些幫助,這樣它就會爲每個9DVN取回最新的條目:也就是說,將最後一個生效日期的一行數據拉回來。在mysql中使用最新的「effective_date」返回行
SELECT b.vndr_name AS Supplier,
a.VENDOR_NBR*1000 + a.VENDOR_DEPT_NBR*10 + a.VENDOR_SEQ_NBR AS "9DVN",
a.VENDOR_NBR AS "6DVN",a.VENDOR_DEPT_NBR AS "Dept",
a.VENDOR_SEQ_NBR AS "Seq" ,a.FREIGHT_FACTOR_PCT AS "Rate",
a.Effective_Date AS "Effect Date",
a.LAST_CHANGE_USERID AS "By",
COUNT(a.DC_NBR) AS "DC Count"
FROM MainTable.DC_FRT_FCTR a
INNER JOIN SecondaryTable ON b.vndr_nbr = a.vendor_nbr
ORDER BY a.Effective_Date DESC
GROUP BY B.vndr_name,
a.VENDOR_NBR,
a.VENDOR_DEPT_NBR,
a.VENDOR_SEQ_NBR,
a.FREIGHT_FACTOR_PCT,
Effective_Date,
a.LAST_CHANGE_USERID
您的'DC_FRT_FCTR'表是否有一列標識不同的'9DVN'值? –
這個問題已經在[tag:greatest-n-per-group]標籤下回答了數百次。 –
不,它不。 9dvn是三個字段的連接 – Russell