sql - 不要重复自己 : same SQL query, 而是两个不同的表

Question

我有一个代码完全相同的 SQL 查询，但有两个不同的表(AUDIT_TRAIL_ARCHIVE 和 AUDIT_TRAIL)。我使用“UNION ALL”来获得一个结果。

好程序员用"Don't repeat yourself"原则。优秀的程序员避免 WET(所有东西都写两次)。

如何用“不要重复自己”的原则重写这段代码？

SELECT REPLACE (ENTITY_KEY, 'rss_user_name=CN=', '')
 FROM    AUDIT_TRAIL_ARCHIVE AU
   INNER JOIN
      (SELECT RSS_USER_NAME
         FROM RSS_USER
        WHERE RSS_NAME = 'rmad'
              AND ADD_INFO_MASTER LIKE '%__47__UPN=%@richemont.com%') FALSCH
   ON REPLACE (AU.ENTITY_KEY, 'rss_user_name=CN=', '') =
         FALSCH.RSS_USER_NAME
WHERE     AU.RSS_NAME = 'rmad'
   AND AU.TABLE_NAME = 'rss_user'
   AND AU.ACTION = 'Insert'
   AND AU.ENTITY_KEY LIKE 'rss_user_name=CN=%'
   AND AU.ORIGIN != 'RSS'
UNION ALL
SELECT REPLACE (ENTITY_KEY, 'rss_user_name=CN=', '')
 FROM    AUDIT_TRAIL AU
   INNER JOIN
      (SELECT RSS_USER_NAME
         FROM RSS_USER
        WHERE RSS_NAME = 'rmad'
              AND ADD_INFO_MASTER LIKE '%__47__UPN=%@richemont.com%') FALSCH
   ON REPLACE (AU.ENTITY_KEY, 'rss_user_name=CN=', '') =
         FALSCH.RSS_USER_NAME
WHERE     AU.RSS_NAME = 'rmad'
   AND AU.TABLE_NAME = 'rss_user'
   AND AU.ACTION = 'Insert'
   AND AU.ENTITY_KEY LIKE 'rss_user_name=CN=%'
   AND AU.ORIGIN != 'RSS'

Answer 1

例如:

SELECT REPLACE (ENTITY_KEY, 'rss_user_name=CN=', '')
 FROM    (select * --or relevant columns
          from AUDIT_TRAIL_ARCHIVE AU
          union all
          select * 
          from AUDIT_TRAIL AU
           ) AU
   INNER JOIN
      (SELECT RSS_USER_NAME
         FROM RSS_USER
        WHERE RSS_NAME = 'rmad'
              AND ADD_INFO_MASTER LIKE '%__47__UPN=%@richemont.com%') FALSCH
   ON REPLACE (AU.ENTITY_KEY, 'rss_user_name=CN=', '') =
         FALSCH.RSS_USER_NAME
WHERE     AU.RSS_NAME = 'rmad'
   AND AU.TABLE_NAME = 'rss_user'
   AND AU.ACTION = 'Insert'
   AND AU.ENTITY_KEY LIKE 'rss_user_name=CN=%'
   AND AU.ORIGIN != 'RSS'