SQL 查询 - 如何抑制结果集中的重复值？答案

【问题标题】：SQL Query - How to suppress repeating values in the result set?SQL 查询 - 如何抑制结果集中的重复值？
【发布时间】：2018-10-23 04:29:20
【问题描述】：

我正在尝试抑制 TotalCarton 列中的重复值。已尝试将值替换为空白或 null，但失败了。有什么帮助吗？

这是 SQL 脚本：

SELECT ORDERS.StorerKey,
    ORDERS.OrderKey, 
    PackKey = (SELECT MAX(PackKey) FROM BAX_PACK_DTL WITH (NOLOCK) WHERE ORderKey = ORDERS.OrderKey),
    PackHU = BAX_PACK_DTL.OuterPackID,
    SalesOrderNum = ( SELECT Upper(Max(ORDERDETAIL.CustShipInst01)) FROM ORDERDETAIL WITH (NOLOCK) WHERE OrderKey = ORDERS.OrderKey),
    DeliveryNum = Upper(ORDERS.ExternOrderKey),     
    TotalCarton = ( CASE BAX_PACK_DTL.PackType WHEN 'C' THEN Count(DISTINCT(BAX_PACK_DTL.OuterPackID))
                    ELSE 0 END ),
    TotalPallet = ( CASE BAX_PACK_DTL.PackType WHEN 'P' THEN Count(DISTINCT(BAX_PACK_DTL.OuterPackID))
                    ELSE 0 END ),
    SumCarton = (SELECT COUNT(DISTINCT(OuterPackSeq)) FROM BAX_PACK_DTL WITH (NOLOCK) WHERE PackType = 'C' AND PackKey = '0000000211'),
    SumPallet = (SELECT COUNT(DISTINCT(OuterPackSeq)) FROM BAX_PACK_DTL WITH (NOLOCK) WHERE PackType = 'P' AND PackKey = '0000000211'),             
    AddWho = Upper(ORDERS.EditWho), 
    ORDERS.AddDate
FROM ORDERS WITH (NOLOCK) INNER JOIN ORDERDETAIL WITH (NOLOCK) ON ORDERS.StorerKey = ORDERDETAIL.StorerKey 
                AND ORDERS.OrderKey = ORDERDETAIL.OrderKey
            INNER JOIN PICKDETAIL WITH (NOLOCK) ON ORDERDETAIL.StorerKey = PICKDETAIL.StorerKey 
                AND ORDERDETAIL.OrderKey = PICKDETAIL.OrderKey
                AND ORDERDETAIL.OrderLineNumber = PICKDETAIL.OrderLineNumber
            INNER JOIN BAX_PACK_DTL WITH (NOLOCK) ON PICKDETAIL.OrderKey = BAX_PACK_DTL.OrderKey 
                AND PICKDETAIL.PickDetailKey = BAX_PACK_DTL.PickDetailKey
WHERE (SELECT COUNT(DISTINCT(ORDERKEY)) FROM PICKDETAIL WITH (NOLOCK) WHERE OrderKey = ORDERS.OrderKey ) > 0
AND BAX_PACK_DTL.PackKey = '0000000211'
AND BAX_PACK_DTL.OuterPackID IN 
('P111111111',
'P22222222',
'P33333333')
GROUP BY ORDERS.StorerKey,
    ORDERS.OrderKey, 
    ORDERS.ExternOrderKey,
    ORDERS.HAWB,
    ORDERS.SO,
    ORDERS.EditWho, 
    ORDERS.AddDate,
    PICKDETAIL.WaveKey,
    BAX_PACK_DTL.OuterPackID,
    BAX_PACK_DTL.PackKey,
    BAX_PACK_DTL.PackType
ORDER BY BAX_PACK_DTL.OuterPackID ASC

以下是基于上述查询的当前结果集。

【问题讨论】：

这两个“重复”记录的 DeliveryNum 值不同。 您想保留哪一个，为什么？
从 OrderKey 列直到 DeliveryNum 被保留。只有 Total Carton 应该被压制。
不，我是说您有两行重复的行，但是您保留/丢弃其中一行的逻辑是什么？

标签： sql sql-server-2008 sql-server-2008-r2

【解决方案1】：

您的代码看起来很奇怪。我希望查询使用条件聚合，看起来更像这样：

SELECT ORDERS.StorerKey, ORDERS.OrderKey, 
       PackKey = (SELECT MAX(PackKey) FROM BAX_PACK_DTL WITH (NOLOCK) WHERE ORderKey = ORDERS.OrderKey),
       PackHU = BAX_PACK_DTL.OuterPackID,
       SalesOrderNum = ( SELECT Upper(Max(ORDERDETAIL.CustShipInst01)) FROM ORDERDETAIL WITH (NOLOCK) WHERE OrderKey = ORDERS.OrderKey),
       DeliveryNum = Upper(ORDERS.ExternOrderKey),     
       TotalCarton = COUNT(DISTINCT CASE BAX_PACK_DTL.PackType WHEN 'C' THEN BAX_PACK_DTL.OuterPackID END),
       TotalPallet = COUNT(DISTINCT CASE BAX_PACK_DTL.PackType WHEN 'P' THEN BAX_PACK_DTL.OuterPackID END),
       SumCarton = (SELECT COUNT(DISTINCT(OuterPackSeq)) FROM BAX_PACK_DTL bpd WHERE pbd.PackType = 'C' AND pbd.PackKey = '0000000211'),
       SumPallet = (SELECT COUNT(DISTINCT(OuterPackSeq)) FROM BAX_PACK_DTL bpd WHERE pbd.PackType = 'P' AND pbd.PackKey = '0000000211'),             
       AddWho = Upper(ORDERS.EditWho), 
       ORDERS.AddDate
FROM . . .
GROUP BY ORDERS.StorerKey, ORDERS.OrderKey, Upper(ORDERS.ExternOrderKey),
         Upper(ORDERS.EditWho), ORDERS.AddDate;

这可能不准确。鉴于表结构，您没有限定列名，并且正在使用非常神秘的查询语法，混合子查询和聚合。但它应该给出一个想法。

【讨论】：