连接两个表并需要在 ON 子句中具有 MAX 聚合函数

Question

这是我的代码！我想在我的报告中提供零件 ID 和采购订单 ID，它会提供所有与这些规格相关的信息。重要的是，如果我们有相同的采购订单 ID 和零件 ID，我们需要代码 return 具有最高交易 ID 的结果。以下代码没有提供我所期望的。你能帮帮我吗？

SELECT MAX(INVENTORY_TRANS.TRANSACTION_ID), INVENTORY_TRANS.PART_ID
, INVENTORY_TRANS.PURC_ORDER_ID, TRACE_INV_TRANS.QTY, TRACE_INV_TRANS.CREATE_DATE, TRACE_INV_TRANS.TRACE_ID
FROM INVENTORY_TRANS    
JOIN TRACE_INV_TRANS ON INVENTORY_TRANS.TRANSACTION_ID = TRACE_INV_TRANS.TRANSACTION_ID    
WHERE INVENTORY_TRANS.PART_ID = @PartID 
    AND INVENTORY_TRANS.PURC_ORDER_ID = @PurchaseOrderID    
GROUP BY TRACE_INV_TRANS.QTY, TRACE_INV_TRANS.CREATE_DATE, TRACE_INV_TRANS.TRACE_ID, INVENTORY_TRANS.PART_ID
, INVENTORY_TRANS.PURC_ORDER_ID

trace_inventory_transtable的样本是：

part_id   trace_id    transaction id     qty       create_date     
x           1             10
x           2             11
x           3             12

inventory_transtable的样本是：

transaction_id     part_id     purc_order_id
11                 x            p20
12                 x            p20

我想获得最大交易的结果，即交易 12，但它显示交易 11

Answer 1

我会使用子查询来查找 MAX 值，然后将该结果与另一个 table.

ORDER BY + TOP (1) returns transaction_id 的 MAX 值。

SELECT 
   inv.transaction_id
  ,inv.part_id
  ,inv.purc_order_id
  ,tr.qty
  ,tr.create_date
  ,tr.trace_id
FROM 
  (
    SELECT TOP (1)
      transaction_id,
      part_id,
      purc_order_id
    FROM 
      INVENTORY_TRANS
    WHERE 
      part_id = @PartID
      AND 
      purc_order_id = @PurchaseOrderID
    ORDER BY 
      transaction_id DESC
  ) AS inv
JOIN 
  TRACE_INV_TRANS AS tr
    ON inv.transaction_id = tr.transaction_id;

结果：

+----------------+---------+---------------+------+-------------+----------+
| transaction_id | part_id | purc_order_id | qty  | create_date | trace_id |
+----------------+---------+---------------+------+-------------+----------+
|             12 | x       | p20           | NULL | NULL        |        3 |
+----------------+---------+---------------+------+-------------+----------+

Rextester Demo

连接两个表并需要在 ON 子句中具有 MAX 聚合函数

Joining two tables and need to have MAX aggregate function in ON clause

sql-server

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