TRIM 在 Oracle 的 MAX 函数下不起作用

Question

我有一个选择查询，我想要

TRIM

一列，该列已经作为 MAX 函数。我尝试了下面的方法，但它不起作用。

SELECT MAX( id ) KEEP (  -- 102436
         DENSE_RANK LAST
         ORDER BY TENANCY_CHANGEDDATE NULLS FIRST,
                  RRH_CHANGEDDATE    NULLS FIRST,
                  ID_OD_CHANGEDDATE   NULLS FIRST
       ) AS id,
       MAX( cmp ) KEEP (
         DENSE_RANK LAST
         ORDER BY TENANCY_CHANGEDDATE NULLS FIRST,
                  RRH_CHANGEDDATE    NULLS FIRST,
                  ID_OD_CHANGEDDATE   NULLS FIRST,
                  id
       ) AS cmp,
MAX(TRIM(SITE_NAME)) KEEP (
     -- regex_replace( MAX( SITE_NAME ), '\W', '') KEEP (
         DENSE_RANK LAST
         ORDER BY SITE_NAME  NULLS FIRST,
                  id
       ) AS SITE_NAME 
FROM   TBL_IPCOLO_BILLING_MST
GROUP BY sap_id;

Answer 1

看起来您正在尝试将 MAX 函数内的 TRIM 函数与 KEEP 子句一起使用

SELECT MAX(id) KEEP (DENSE_RANK LAST ORDER BY TENANCY_CHANGEDDATE NULLS FIRST, RRH_CHANGEDDATE NULLS FIRST, ID_OD_CHANGEDDATE NULLS FIRST) AS id,
   MAX(cmp) KEEP (DENSE_RANK LAST ORDER BY TENANCY_CHANGEDDATE NULLS FIRST, RRH_CHANGEDDATE NULLS FIRST, ID_OD_CHANGEDDATE NULLS FIRST, id) AS cmp,
   MAX(TRIM(SITE_NAME)) KEEP (DENSE_RANK LAST ORDER BY SITE_NAME NULLS FIRST, id) AS SITE_NAME

来自 TBL_IPCOLO_BILLING_MST 按 sap_id 分组；

确保在应用 TRIM 函数之前关闭 MAX 函数的括号。另外，请确保要应用 TRIM 函数的列是字符串数据类型