如何在未分组的列上获取最新插入的值？

Question

如何从下面的查询中以更有效和优雅的方式获取 MY_LATEST_INSERTED_NUMBER_BASING_ON_MY_DATE_COLUMN_FOR_ID_CONTEXT ？

SELECT MAX(MY_DATE_COLUMN),
 ID,
 listagg(SOME_COLUMN, '') within GROUP (ORDER BY MY_DATE_COLUMN),
 SUBSTR(
      listagg(MY_NUMBER, ';') within GROUP (ORDER BY MY_DATE_COLUMN DESC),
      1,
      instr(
             listagg(MY_NUMBER, ';') within GROUP (ORDER BY MY_DATE_COLUMN DESC),'-') - 1
           ) as MY_LATEST_INSERTED_NUMBER_BASING_ON_MY_DATE_COLUMN_IN_ID_CONTEXT
 FROM MY_TABLE
 GROUP BY ID;

Answer 1

如果我理解正确，你想要keep：

SELECT MAX(MY_DATE_COLUMN), ID,
       listagg(SOME_COLUMN, '') within GROUP (ORDER BY MY_DATE_COLUMN),
       max(MY_LATEST_INSERTED_NUMBER_BASING_ON_MY_DATE_COLUMN_IN_ID_CONTEXT)
           keep (dense_rank first order by MY_DATE_COLUMN DESC)
FROM MY_TABLE
GROUP BY ID;

全部大写并不能真正帮助传达您想要做什么。