Question

我有麻烦想弄清楚如何从第一张桌子摆脱欺骗。请在此处查看突出显示的行，以供参考enter image description here

这是我输入的格式

SELECT
     "Classes.Class Name" AS Customer,
     "Customers.Customer Name" as docket,
     "Items.Item Name" as EST_Item,
     Quantity as EST_Qty,
     "Unit Price" as EST_UnitPrice,
     "Query_Bill Line items"."Items.Item Name" as BILL_Item,
     "Query_Bill Line items"."Quantity" as Bill_Qty,
     "Query_Bill Line items"."Unit Price" as Bill_UnitPrice
FROM  "Query_Estimate Line Items" LEFT JOIN "Query_Bill Line Items" ON "Query_Estimate Line Items"."cUSTOMERS.cUSTOMER NAME"  = "Query_Bill Line Items"."CUSTOMERS.CUSTOMER NAME"
 AND    "Query_Estimate Line Items"."iTEMS.ITEM NAME"  = "Query_Bill Line Items"."ITEMS.ITEM NAME"

抱歉超长列名！从Table1＆＃34;＆＃34; Query_Estimate Line Items＆＃34;＆lt; 34;

中删除欺骗，我错过了什么？

谢谢

Answer 1

要减少行数，您需要按某些内容（例如Customer，Docket，EST_Item）进行分组，并聚合未分组的列（例如Bill_Qty或Unit_Price）。你知道如何使用group by吗？

SQL Join导致多个重复条目

1 个答案: