以下是代码:
SELECT tblitem.strItemCode, tblitem.strItemName, tblitemunit.strItemUnitName, tblvendor.strVendName, MAX(tblitemprice.dtmItemPasOf) AS Expr1,
tblitemprice.dblItemPAmount
FROM tblclassification INNER JOIN
tblitem ON tblclassification.strClasCode = tblitem.strItemClasCode INNER JOIN
tblitemprice ON tblitem.strItemCode = tblitemprice.strItemPItemCode INNER JOIN
tblitemunit ON tblitemprice.strItemPItemUnitCode = tblitemunit.strItemUnitCode INNER JOIN
tblvendor ON tblclassification.strClasCode = tblvendor.strVendClasCode AND tblitemprice.strItemPVendCode = tblvendor.strVendCode AND tblitem.deleted_at IS NULL
GROUP BY tblitem.strItemCode, tblitem.strItemName, tblitemunit.strItemUnitName, tblvendor.strVendName, tblitemprice.dblItemPAmount
以下是结果:
CODE NAME UNIT VENDOR DATE PRICE
ITEM101-Fudgee Bar-Piece-Imus Palengke 10/9/20165:03:32AM - 6.5
ITEM102-Yum Burger-Box-Jollibee Lumina Mall-10/9/2016 6:13:27 AM - 2500
ITEM102-Yum Burger-Piece-Jollibee Lumina Mall-10/9/2016 4:42:28 AM - 30
ITEM102-Yum Burger-Piece-Jollibee Lumina Mall-10/13/2016 12:37:31 PM- 35
ITEM102-Yum Burger Piece Jollibee Lumina Mall 10/14/2016 10:05:44 PM 40
我想要的是只获取最新价格的行。有谁可以帮助我吗。
我想要获取Item101,而只想获取最后一行到ITEM102。
答案 0 :(得分:1)
如果我理解正确,您正在寻找最后更新的行价。这样做很容易:
ORDER BY <FIELD_NAME> DESC
)订购数据。根据我从您的查询和结果中收集的内容,Expr1
是给定价格的最新日期。LIMIT 1
)。由于您的数据已按逆时间顺序排序,因此您一定要选择最新的数据。那个SQL将是
SELECT tblitem.strItemCode, tblitem.strItemName, tblitemunit.strItemUnitName, tblvendor.strVendName, MAX(tblitemprice.dtmItemPasOf) AS Expr1,
tblitemprice.dblItemPAmount
FROM tblclassification INNER JOIN
tblitem ON tblclassification.strClasCode = tblitem.strItemClasCode INNER JOIN
tblitemprice ON tblitem.strItemCode = tblitemprice.strItemPItemCode INNER JOIN
tblitemunit ON tblitemprice.strItemPItemUnitCode = tblitemunit.strItemUnitCode INNER JOIN
tblvendor ON tblclassification.strClasCode = tblvendor.strVendClasCode AND tblitemprice.strItemPVendCode = tblvendor.strVendCode AND tblitem.deleted_at IS NULL
GROUP BY tblitem.strItemCode, tblitem.strItemName, tblitemunit.strItemUnitName, tblvendor.strVendName, tblitemprice.dblItemPAmount
ORDER BY Expr1 DESC
LIMIT 1
尝试一下!