如何使用Teradata中的行號更新列的值

Question

我想以這種方式更新列的值

new value  = old value + row_number() * 1000

同樣對於row_number我想按舊值使用order

但我沒有找到任何解決方案。

樣本數據

column    
   1
   3
   5

更新查詢后，它應該是

column
  1001
  2003
  3005

Answer 1

CREATE VOLATILE TABLE test, NO FALLBACK
(MyCol SMALLINT NOT NULL)
PRIMARY INDEX (MyCol)
ON COMMIT PRESERVE ROWS;

INSERT INTO test VALUES (1);
INSERT INTO test VALUES (3);
INSERT INTO test VALUES (5);

SELECT MyCol FROM test;

UPDATE test
  FROM (SELECT MyCol
             , ROW_NUMBER() OVER (ORDER BY MyCol) AS RowNum_
          FROM test) DT1
   SET MyCol = test.MyCol + (RowNum * 1000)
 WHERE test.MyCol DT1.MyCol;

SELECT MyCol FROM TEST;