Question

需要SQL脚本来删除重复记录。以下是示例数据 •示例1：运行脚本之前

CreatedWhen               Status    CVGUID      LocGUID 
-----------------------  ---------------- --------------- -------------
2015-11-04 11:00:00.667    CUR    65400270        5300610      
2015-11-04 10:44:36.327    PRV    65400270        5300610      
2015-11-04 10:43:03.340    INA    65400270        5300610      
2015-11-04 10:39:34.100    INA    65400270        5300610      
2015-11-04 10:35:17.880    INA    65400270        5300610

•示例1：运行脚本后

CreatedWhen              Status ClientVisitGUID LocationGUID  
----------------------- ---------------- --------------- -------------
2015-11-04 11:00:00.667   CUR    65400270        5300610

•示例2：运行脚本之前

CreatedWhen              Status CVGUID          LocGUID 
 -----------------------  ------ ---------------- -------------
 2015-11-09 04:41:16.340  CUR    65500270         6000610      
 2015-11-09 04:40:00.527  PRV    65500270         6000610      
 2015-11-09 04:38:13.790  INA    65500270         5300610      
 2015-11-09 04:33:23.843  INA    65500270         5300610

•示例2：运行脚本后

CreatedWhen              Status CVGUID          LocGUID 
 -----------------------  ------ ---------------- -------------
2015-11-09 04:41:16.340  CUR    65500270         6000610            
 2015-11-09 04:33:23.843 PRV    65500270         5300610

•示例3：运行脚本之前

CreatedWhen              Status CVGUID          LocGUID 
 -----------------------  ------ ---------------- -------------
2015-11-09 06:07:19.880  CUR    65600270         6000610      
 2015-11-09 06:06:48.970  PRV    65600270         5300610      
 2015-11-09 06:06:24.890  INA    65600270         7100610      
 2015-11-09 06:06:00.330  INA    65600270         6000610      
 2015-11-09 06:03:52.070  INA    65600270         5300610

•示例3：运行脚本后（不应有任何更改）

CreatedWhen              Status CVGUID          LocGUID  
 -----------------------  ------ ---------------- -------------
 2015-11-09 06:07:19.880  CUR    65600270         6000610      
 2015-11-09 06:06:48.970  PRV    65600270         5300610      
 2015-11-09 06:06:24.890  INA    65600270         7100610      
 2015-11-09 06:06:00.330  INA    65600270         6000610      
 2015-11-09 06:03:52.070  INA    65600270         5300610

Answer 1

使用空格作为分隔符将数据拆分为列
使用ROW_NUMBER（）OVER（由CVGUID分区，由CreatedWhen创建的LOCGUID ORDER）来标记重复项
使用row_number＆gt;删除所有行1

如果您不知道如何执行上述步骤，我建议您使用Google或堆栈溢出来查找答案，因为这些是非常常见的问题

Answer 2

试试这个：

With cte as
(
  SELECT MAX(CreatedWhen) CreatedWhen, CVGUID, LocGUID
  INTO #temp
  FROM TableName
  GROUP BY CVGUID, LocGUID
)
With cte2 as
(
  SELECT CreatedWhen, ROW_NUMBER() OVER (ORDER BY CreatedWhen DESC PARTITION BY CVGUID) row_num, CVGUID, LocGUID
  FROM cte 
)
SELECT CreatedWhen, CASE WHEN row_num = 1 THEN 'CUR' WHEN row_num = 2 THEN 'PRV' ELSE 'INA' END Status, CVGUID, LocGUID
FROM cte2;

如果解决方案有任何问题，请告诉我。

用于删除重复记录的SQL脚本

2 个答案: