具有n-2数据的Oracle Update n-1列（如果可用，否则为'NEW'

Question

我们正在使用Oracle v12 +

我们有一种情况，每当每个status有第一个RENEW时，我们就需要更新ID 列为先前的值（它是功能ID，并且有许多行针对一个ID）。

请参见下面的示例I / O。每个ID的数据均按时间戳排序。

我们需要特定的联接进行更新吗？为此，我已将数据复制到临时表中，但没有成功。

表名：table_book_status

Input
[id]        [word]  [status]   [timestamp]
B000JMLBHU  book    RENEW
B000JMLBHU  read    RENEW
B000JMLBHU  was     MODIFY
B000JMLBHU  story   ADD
B000R93D4Y  with    RENEW
B000R93D4Y  book    RENEW
B000R93D4Y  story   RENEW
B000R93D4Y  was     MODIFY
B000R93D4Y  have    ADD
B001892DGG  was     ADD
B001892DWA  was     ADD
B001BXNQ2O  was     RENEW
B001BXNQ2O  book    RENEW
B001H55R8M  was     MODIFY
B001HQHCBQ  was     ADD
B001HQHCBQ  story   ADD
B001HQHCBQ  bella   ADD
B001HQHCBQ  with    ADD
B001HQHCBQ  love    ADD
B001HQHCBQ  zsadist ADD


Output
[id]        [word]  [status]    [timestamp]
B000JMLBHU  book    RENEW
B000JMLBHU  read    **MODIFY**
B000JMLBHU  was     MODIFY
B000JMLBHU  story   ADD
B000R93D4Y  with    RENEW
B000R93D4Y  book    RENEW
B000R93D4Y  story   **MODIFY**
B000R93D4Y  was     MODIFY
B000R93D4Y  have    ADD
B001892DGG  was     ADD
B001892DWA  was     ADD
B001BXNQ2O  was     RENEW
B001BXNQ2O  book    **ADD**
B001H55R8M  was     MODIFY
B001HQHCBQ  was     ADD
B001HQHCBQ  story   ADD
B001HQHCBQ  bella   ADD
B001HQHCBQ  with    ADD
B001HQHCBQ  love    ADD
B001HQHCBQ  zsadist ADD

Answer 1

您可以如下使用lag和sum窗口功能：

select id, word, 
       case when sm = 1 and status = 'Renew' 
            then coalesce(lgst, 'Add') 
       end as status, 
       timestamp 
from
    (select id, word, status, 
            sum(case when status = 'Renew' then 1 else 0 end) over (partition by id order by timestamp) as sm,
            lag(status) over (partition by id order by timestamp) as lgst, timestamp
       from your_table)