如何使用Teradata中的行号更新列的值

Question

我想以这种方式更新列的值

new value  = old value + row_number() * 1000

同样对于row_number我想按旧值使用order

但我没有找到任何解决方案。

样本数据

column    
   1
   3
   5

更新查询后，它应该是

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;