Question

我正在尝试从此SQL中删除重复行，并且正在传递两次产品代码。我想从这个SQL中获得一个公共数据。我在PostgreSQL数据库中运行这个SQL。

＆＃xA;＆＃xA;

SQL查询是：

＆＃xA;＆＃xA;

  SELECT DISTINCT＆ #xA; csi.style_item_id AS id，＆＃xA; csi.item_code AS item_code，＆＃xA; csi.quantity AS quantity，＆＃xA; std_unit.stdum_name AS standard_unit，＆＃xA; csi.total_cost AS total_cost，＆＃xA; cim.item_name AS item_name，＆＃xA; pid.product_code AS product_code＆＃xA; FROM cm_items_master cim，＆＃xA; cm_style_items csi，＆＃xA; stdunit_master std_unit，＆＃xA; cm_style_ccode_master sccm，＆＃xA; cm_style_designer sd，＆＃xA; cm_designer_master dm，＆＃xA; cm_production_info_details pid＆＃xA; WHERE pid.style_ccode_id = sccm.style_ccode_id＆＃xA; AND csi.cm_item_id = cim.item_id＆＃xA; AND csi.std_unit_id = std_unit.id＆＃xA; AND csi.style_ccode_id = sccm.style_ccode_id＆＃xA; AND sccm.style_ccode_id = sd.style_ccode_id＆＃xA; AND sd.designer_id = dm.designer_id＆＃xA; AND pid.product_code IN（getSplitedPdtCode（productCode））＆＃xA; AND csi.is_delete ='N'＆＃xA; AND cim.is_delete ='N'＆＃xA; AND std_unit.is_delete ='N'＆＃xA;

＆＃xA;＆＃xA;

此SQL返回同一行4次。我不想要重复的数据。

＆＃xA;

Answer 1

尝试此查询，它会对您有所帮助。

SELECT DISTINCT 
  csi.style_item_id AS id,  
  csi.item_code AS item_code,  
  csi.quantity AS quantity,  
  std_unit.stdum_name AS standard_unit,  
  csi.total_cost AS total_cost,  
  cim.item_name AS item_name,  
  pid.product_code AS product_code  
FROM (cm_items_master cim,  
  cm_style_items csi,  
  stdunit_master std_unit,  
  cm_style_ccode_master sccm,  
  cm_style_designer sd,  
  cm_designer_master dm,  
  cm_production_info_details pid) A
WHERE pid.style_ccode_id = sccm.style_ccode_id  
  AND csi.cm_item_id  = cim.item_id  
  AND csi.std_unit_id  = std_unit.id  
  AND csi.style_ccode_id   = sccm.style_ccode_id  
  AND sccm.style_ccode_id  = sd.style_ccode_id  
  AND sd.designer_id  = dm.designer_id  
  AND pid.product_code     IN (  getSplitedPdtCode(productCode) )  
  AND csi.is_delete        = 'N'
  AND cim.is_delete        = 'N'  
  AND std_unit.is_delete   = 'N'
  AND CTID in (select max(CTID) from A group by id)

Answer 2

在SQL中删除重复项的最佳方法

List<Point3D> Positions= PositionsString.Value.Split(' ')
                                 .Select(Point3D.Parse)
                                 .ToList();

将以上结果存储在临时表中，并从临时表中选择数据，其中row = 1，这将为您提供by by子句中列出列的唯一行。

Answer 3

With CTE_Dup as emp
    (Select *, row_number() over(partition by Empid order by Empid) as rownumber 
    from employee)
Delete from emp
where rownuber > 1

如何从sql中删除重复数据

3 个答案: