SQL：如何避免复制粘贴相同的代码？只编写一次代码并稍后调用它？

我有一个很长的SQL脚本。非常难看的是，我被迫复制和粘贴现有代码很多次。我宁愿参考现有的代码。SQL：如何避免复制粘贴相同的代码？只编写一次代码并稍后调用它？

我的目标是每个代码块只写一次。如果我需要第二次，我参考它。这可能没有意见吗？

SELECT batch 
FROM (SELECT 'DISCONNECT ent_user FROM job_code WITH user_id ="' 
      || a.user_id 
      || '" , jc_name = "' 
      || b.jc_name 
      || '";' 
       AS batch, 
      1 AS my_order 
     FROM ent_user a, user_jc b 
     WHERE a.user_id IN (SELECT user_id 
          FROM (SELECT REPLACE (overview.entity_key, 
               'user_id=', 
               '') 
              AS USER_ID, 
             details.old_value_str, 
             SUBSTR (
              details.old_value_str, 
              1, 
              INSTR (details.old_value_str, 
                '-', 
                1, 
                1) 
              - 1) 
              AS OLD_PREFIX, 
             details.new_value_str, 
             SUBSTR (
              details.new_value_str, 
              1, 
              INSTR (details.new_value_str, 
                '-', 
                1, 
                1) 
              - 1) 
              AS NEW_PREFIX, 
             overview.from_event_time, 
             CASE 
              WHEN SUBSTR (
                details.old_value_str, 
                1, 
                INSTR (
                 details.old_value_str, 
                 '-', 
                 1, 
                 1) 
                - 1) = 
                SUBSTR (
                 details.new_value_str, 
                 1, 
                 INSTR (
                 details. 
                  new_value_str, 
                 '-', 
                 1, 
                 1) 
                 - 1) 
              THEN 
               'OK' 
              ELSE 
               'DELETE' 
             END 
              AS COMPARE 
            FROM audit_trail overview 
             INNER JOIN 
              audit_info details 
             ON overview.serial = details.serial 
            WHERE TO_CHAR (SYSDATE, 'IW-YYYY') = 
              TO_CHAR (
               overview.from_event_time, 
               'IW-YYYY') 
             AND details.field_name = 
               '__99__Department' 
             AND overview.action = 'Update' 
             AND CASE 
               WHEN SUBSTR (
                 details. 
                 old_value_str, 
                 1, 
                 INSTR (
                  details. 
                  old_value_str, 
                  '-', 
                  1, 
                  1) 
                 - 1) = 
                 SUBSTR (
                  details. 
                  new_value_str, 
                  1, 
                  INSTR (
                  details. 
                   new_value_str, 
                  '-', 
                  1, 
                  1) 
                  - 1) 
               THEN 
                'OK' 
               ELSE 
                'DELETE' 
              END = 'DELETE' 
             AND REPLACE (overview.entity_key, 
                'user_id=', 
                '') NOT LIKE 
               'EXT%' 
             AND details.old_value_str LIKE 
               'INT%' 
             AND details.new_value_str NOT LIKE 
               'INT%')) 
      AND a.user_id = b.user_id 
     UNION 
     SELECT 'DISCONNECT rss_user FROM user_group WITH rss_user_name = "' 
      || b.rss_user_name 
      || '" rss_name = "' 
      || b.rss_name 
      || '" rss_type = "' 
      || b.rss_type 
      || '" , ug_name = "' 
      || b.ug_name 
      || '";' 
       AS batch, 
      2 AS my_order 
     FROM ent_user a, ru_ug b 
     WHERE a.user_id IN (SELECT user_id 
          FROM (SELECT REPLACE (overview.entity_key, 
               'user_id=', 
               '') 
              AS USER_ID, 
             details.old_value_str, 
             SUBSTR (
              details.old_value_str, 
              1, 
              INSTR (
               details.old_value_str, 
               '-', 
               1, 
               1) 
              - 1) 
              AS OLD_PREFIX, 
             details.new_value_str, 
             SUBSTR (
              details.new_value_str, 
              1, 
              INSTR (
               details.new_value_str, 
               '-', 
               1, 
               1) 
              - 1) 
              AS NEW_PREFIX, 
             overview.from_event_time, 
             CASE 
              WHEN SUBSTR (
                details. 
                old_value_str, 
                1, 
                INSTR (
                 details. 
                 old_value_str, 
                 '-', 
                 1, 
                 1) 
                - 1) = 
                SUBSTR (
                 details. 
                 new_value_str, 
                 1, 
                 INSTR (
                 details. 
                  new_value_str, 
                 '-', 
                 1, 
                 1) 
                 - 1) 
              THEN 
               'OK' 
              ELSE 
               'DELETE' 
             END 
              AS COMPARE 
            FROM audit_trail overview 
             INNER JOIN 
              audit_info details 
             ON overview.serial = 
               details.serial 
            WHERE TO_CHAR (SYSDATE, 'IW-YYYY') = 
              TO_CHAR (
               overview.from_event_time, 
               'IW-YYYY') 
             AND details.field_name = 
               '__99__Department' 
             AND overview.action = 'Update' 
             AND CASE 
               WHEN SUBSTR (
                 details. 
                 old_value_str, 
                 1, 
                 INSTR (
                  details. 
                  old_value_str, 
                  '-', 
                  1, 
                  1) 
                 - 1) = 
                 SUBSTR (
                  details. 
                  new_value_str, 
                  1, 
                  INSTR (
                  details. 
                   new_value_str, 
                  '-', 
                  1, 
                  1) 
                  - 1) 
               THEN 
                'OK' 
               ELSE 
                'DELETE' 
              END = 'DELETE' 
             AND REPLACE (
               overview.entity_key, 
               'user_id=', 
               '') NOT LIKE 
               'EXT%' 
             AND details.old_value_str LIKE 
               'INT%' 
             AND details.new_value_str NOT LIKE 
               'INT%')) 
      AND a.user_id = b.user_id 
      AND ( b.rss_type = 'TEST14' 
        OR b.rss_type = 'TTTR' 
        OR b.rss_type = 'OFFI2021' 
        OR b.rss_type = 'TEST27' 
        OR b.rss_type = 'TEST22' 
        OR b.rss_type = 'TEST26' 
        OR b.rss_type = 'TEST23' 
        OR b.rss_type = 'TEST39' 
        OR b.rss_type = 'TEST19' 
        OR b.rss_type = 'TEST12' 
        OR b.rss_type = 'TEST16' 
        OR b.rss_type = 'TEST05' 
        OR b.rss_type = 'TEST09' 
        OR b.rss_type = 'HSSO' 
        OR b.rss_type = 'TEST37' 
        OR b.rss_type = 'TEST34' 
        OR b.rss_type = 'TEST1') 
     UNION 
     SELECT 'DELETE rss_user WITH rss_user_name = "' 
      || b.rss_user_name 
      || '" rss_name = "' 
      || b.rss_name 
      || '" rss_type = "' 
      || b.rss_type 
      || '";' 
       AS batch, 
      3 AS my_order 
     FROM ent_user a, rss_user b 
     WHERE a.user_id IN (SELECT user_id 
          FROM (SELECT REPLACE (overview.entity_key, 
               'user_id=', 
               '') 
              AS USER_ID, 
             details.old_value_str, 
             SUBSTR (
              details.old_value_str, 
              1, 
              INSTR (
               details.old_value_str, 
               '-', 
               1, 
               1) 
              - 1) 
              AS OLD_PREFIX, 
             details.new_value_str, 
             SUBSTR (
              details.new_value_str, 
              1, 
              INSTR (
               details.new_value_str, 
               '-', 
               1, 
               1) 
              - 1) 
              AS NEW_PREFIX, 
             overview.from_event_time, 
             CASE 
              WHEN SUBSTR (
                details. 
                old_value_str, 
                1, 
                INSTR (
                 details. 
                 old_value_str, 
                 '-', 
                 1, 
                 1) 
                - 1) = 
                SUBSTR (
                 details. 
                 new_value_str, 
                 1, 
                 INSTR (
                 details. 
                  new_value_str, 
                 '-', 
                 1, 
                 1) 
                 - 1) 
              THEN 
               'OK' 
              ELSE 
               'DELETE' 
             END 
              AS COMPARE 
            FROM audit_trail overview 
             INNER JOIN 
              audit_info details 
             ON overview.serial = 
               details.serial 
            WHERE TO_CHAR (SYSDATE, 'IW-YYYY') = 
              TO_CHAR (
               overview.from_event_time, 
               'IW-YYYY') 
             AND details.field_name = 
               '__99__Department' 
             AND overview.action = 'Update' 
             AND CASE 
               WHEN SUBSTR (
                 details. 
                 old_value_str, 
                 1, 
                 INSTR (
                  details. 
                  old_value_str, 
                  '-', 
                  1, 
                  1) 
                 - 1) = 
                 SUBSTR (
                  details. 
                  new_value_str, 
                  1, 
                  INSTR (
                  details. 
                   new_value_str, 
                  '-', 
                  1, 
                  1) 
                  - 1) 
               THEN 
                'OK' 
               ELSE 
                'DELETE' 
              END = 'DELETE' 
             AND REPLACE (
               overview.entity_key, 
               'user_id=', 
               '') NOT LIKE 
               'EXT%' 
             AND details.old_value_str LIKE 
               'INT%' 
             AND details.new_value_str NOT LIKE 
               'INT%')) 
      AND a.user_id = b.user_id 
      AND ( b.rss_type = 'TEST14' 
        OR b.rss_type = 'TEST27' 
        OR b.rss_type = 'TEST22' 
        OR b.rss_type = 'TEST26' 
        OR b.rss_type = 'TEST23' 
        OR b.rss_type = 'TEST39' 
        OR b.rss_type = 'TEST19' 
        OR b.rss_type = 'TEST12' 
        OR b.rss_type = 'TEST16' 
        OR b.rss_type = 'TEST09' 
        OR b.rss_type = 'TEST05' 
        OR b.rss_type = 'TEST37' 
        OR b.rss_type = 'TEST34' 
        OR b.rss_type = 'TEST1') 
      ORDER BY my_order;

你能重写没有重复代码的查询吗？

来源

2013-02-25 Fyodor Glebov

写程序或功能... – asifsid88 2013-02-25 11:00:17

您可以尝试视图或公用表表达式 – Bulat 2013-02-25 11:16:24

创建像

create view details 
as 
select d.*, 
     substr(d.old_value_str, 1, instr(details.old_value_str, '-', 1, 1) - 1) as old_prefix, 
     substr(d.new_value_str, 1, instr(details.new_value_str, '-', 1, 1) - 1) as new_prefix, 
     case 
     when substr (d.old_value_str, 1, instr (d.old_value_str, '-', 1, 1) - 1) 
       = substr (d.new_value_str, 1, instr (d.new_value_str, '-', 1, 1) - 1) 
     then 
      'OK' 
     else 
      'DELETE' 
     end as compare 
    from audit_info d;

的视图（或使用在with clause而不是视图）

然后只是引用像

WHERE a.user_id IN (SELECT user_id 
         FROM (SELECT REPLACE (overview.entity_key, 
              'user_id=', 
              '') 
             AS USER_ID, 
            details.old_value_str, 
            OLD_PREFIX, 
            details.new_value_str, 
            NEW_PREFIX, 
            overview.from_event_time, 
            COMPARE 
           FROM audit_trail overview 
            INNER JOIN details 
            ON overview.serial = details.serial 
           WHERE TO_CHAR (SYSDATE, 'IW-YYYY') = 
             TO_CHAR (
              overview.from_event_time, 
              'IW-YYYY') 
            AND details.field_name = 
              '__99__Department' 
            AND overview.action = 'Update' 
            AND CASE 
              WHEN old_prefix = 
                new_prefix 
              THEN 
               'OK' 
              ELSE

等。

来源

2013-02-25 11:33:30 DazzaL

SQL：如何避免复制粘贴相同的代码？只编写一次代码并稍后调用它？

回答

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