使用分区的Oracle更新查询

Question

我在Oracle v.12数据库中有以下示例数据

ID | NAME   | DML_TYPE  | FND_FILESEQNO | FND_FILERBA

---------------------------------------------------------

1  | name1a | insert    | 1             | 1

1  | name1b | update    | 1             | 2

2  | name2a | insert    | 2             | 1

2  | name2b | update    | 2             | 2

....

....

....

我想要跟随2笔交易

1. delete old records (FND_FILESEQNO + FND_FILERBA) partition by 'ID' column

2. update latest record DML_TYPE = 'insert'

所以最终，如果我查询这个表，我应该得到以下结果......

ID | NAME   | DML_TYPE  | FND_FILESEQNO | FND_FILERBA

---------------------------------------------------------

1  | name1b | insert    | 1             | 2

2  | name2b | insert    | 2             | 2

非常感谢

Answer 1

试试这个： -

MERGE INTO STACTOVER a
USING (  SELECT * FROM (
      SELECT   STACTOVER.*,Row_Number() OVER(PARTITION BY ID ORDER BY ID)rn 
FROM  STACTOVER)WHERE rn>1
  )b 
ON
(a.ID = b.ID)
WHEN MATCHED THEN
  UPDATE SET a.dml_type = 'insert'
  DELETE WHERE a.NAME != b.NAME ;