手动排序concat文本(不是ASC或DESC)

Question

我有"UNION"这个SQL."FROM"部分被省略.此SQL生成批处理文件,其中命令的顺序很重要.

SELECT    'DISCONNECT ent_user  FROM job_code WITH user_id ="'
       || a.user_id
       || '" , jc_name = "'
       || b.jc_name
       || '";'
  FROM 
  [...]
UNION
SELECT    'DISCONNECT rss_user  FROM user_group WITH rss_user_name = "'
       || a.user_id
       || '"  rss_name = "'
       || b.rss_name
       || '" rss_type = "'
       || b.rss_type
       || '" , ug_name = "'
       || b.ug_name
       || '";'
  FROM 
  [...]
UNION
SELECT    'DELETE rss_user WITH rss_user_name = "'
       || a.user_id
       || '"  rss_name = "'
       || b.rss_name
       || '" rss_type = "'
       || b.rss_type
       || '";'
  FROM 
  [...]

我希望有这种分类.这是手动不是ASC或DESC.

1) DISCONNECT ent_user  FROM job_code ... 
2) DISCONNECT rss_user  FROM user_group ... 
3) DELETE rss_user WITH rss_user_name

怎么做？

Answer 1

选择一个文字数字列和您的代码,然后按顺序排序:

SELECT code_text
  FROM (
        SELECT <code> AS code_text, 1 AS my_order
        ...
        UNION
        SELECT <code> AS code_text, 2 AS my_order
        ...
        [etc.]
       )
 ORDER BY my_order;

然后,您可以设置任何您想要的订单.

希望能帮助到你...