Question

我有一个名为DebitCatdTransaction的表，我想在状态列中将重复数据标记为DUPPAST，但条件是

如果存在任何具有相同TPATransactionId，Channel，EIN和Status不等于NULL的记录，则将状态列更新为DUPPAST

如果您查看下表，那么我需要将状态更新为DUPPAST，以获取第2行和第2行的信息。 3因为2＆amp; 3行数据完全相同，第一行的状态不为NULL。

下面是我的表结构和数据

+------------------+---------+--------+--------+
| TPATransactionId | Channel | EIN    | Status |
+------------------+---------+--------+--------+
| 55277801         | H       | 137580 | TBD    |
+------------------+---------+--------+--------+
| 55277801         | H       | 137580 | NULL   |
+------------------+---------+--------+--------+
| 55277801         | H       | 137580 | NULL   |
+------------------+---------+--------+--------+
| 55277801         | V       | 137580 | NULL   |
+------------------+---------+--------+--------+

下面是相同的脚本结构

DECLARE @DebitCardTransaction TABLE (TPATransactionId INT,Channel VARCHAR(50),EIN INT,Status VARCHAR(50));

INSERT @DebitCardTransaction VALUES (55277801,'H',137580,'TBD')
INSERT @DebitCardTransaction VALUES (55277801,'H',137580,NULL)
INSERT @DebitCardTransaction VALUES (55277801,'H',137580,NULL)
INSERT @DebitCardTransaction VALUES (55277801,'V',137580,NULL)

这是我到目前为止所做的

UPDATE d1
SET d1.Status = 'DUPPAST'
  From @DebitCardTransaction d1 Inner join @DebitCardTransaction d2
  ON d1.TPATransactionId = d2.TPATransactionId
AND d1.Channel=d2.Channel
  AND d1.EIN=d2.EIN
  AND d1.status is null

这就是我期待的输出

+------------------+---------+--------+---------+
| TPATransactionId | Channel | EIN    | Status  |
+------------------+---------+--------+---------+
| 55277801         | H       | 137580 | TBD     |
+------------------+---------+--------+---------+
| 55277801         | H       | 137580 | DUPPAST |
+------------------+---------+--------+---------+
| 55277801         | H       | 137580 | DUPPAST |
+------------------+---------+--------+---------+
| 55277801         | V       | 137580 | NULL    |
+------------------+---------+--------+---------+

Answer 1

您可以使用ROW_NUMBER：

WITH cte AS
(
  SELECT *,
   rn = ROW_NUMBER() OVER(PARTITION BY TPATransactionId, Channel,EIN 
                          ORDER BY Status DESC)
  FROM @DebitCardTransaction
)
UPDATE cte
SET Status = 'DUPPAST'
WHERE Status IS NULL AND rn > 1;

SELECT *
FROM @DebitCardTransaction;

的 LiveDemo

注意：您应该添加ID IDENTITY(1,1)之类的列以获得稳定排序并允许获得第一条记录。

rn = ROW_NUMBER() OVER(PARTITION BY TPATransactionId, Channel,EIN ORDER BY ID)

的 LiveDemo2

修改

没有CTE
是不可能做到的

是：

UPDATE s SET Status = 'DUPPAST' FROM (SELECT *, rn = ROW_NUMBER() OVER(PARTITION BY TPATransactionId, Channel,EIN ORDER BY ID) FROM @DebitCardTransaction) s WHERE Status IS NULL AND rn > 1;

的 LiveDemo3

Answer 2

试试这个，

Thread.sleep(5000);

使用多列比较在SQL Server中使用DUP标记重复数据

2 个答案: