按案例陈述排序不按预期工作

Question

我正在尝试按最终用户想要的方式对报告进行排序。

首先，它应按以下方案排序：

1. 填充String_Field，但Comment_Date为空
2. 未填充String_Field
3. 填充String_Field和Comment_Date

然后它应该按Task_Date的老化排序。

我已将以下内容添加到我的ORDER BY：

(case when max(table1.comment_date) is null then 2 else 1 end) DESC,
(case when table1.string_field is null then 2 else 1 end) ASC,
max(table2.task_date) ASC

然后我将它们添加到我的SELECT中：

(case when max(table1.comment_date) is null then 2 else 1 end) as sort1
(case when table1.string_field is null then 2 else 1 end) as sort2
max(table2.task_date) as task_date

我得到了什么，并且无法弄清楚我的生活为什么，这是（编辑显示每次更改时的高/低）：



我已经尝试过投射，移动聚合并将值加在一起，而我仍然最终将那些2s卡在1s中的一些看不见的分裂中间。

如果它有任何区别，我通过CTE联合查询得出string_field的值，并且在第二个CTE（table1）连接到包含task_date的表之前，在第二个CTE中将comment_date连接到string_field （表2）。你可以有一个没有comment_date的string_field，但是没有一个没有string_field的comment_date。必须有一个task_date才能使报表中显示该条目。该报告按string_field分组。

我在使用SQL Server 2008 R2。

提前感谢您的帮助！

编辑添加Quasi-SQL：

WITH 
old_new_string AS (
    SELECT
    tablea.old_string_field,
    tablea.string_field,
    'A' as match_type
    FROM
    tablea
    WHERE
    tablea.old_string_field is not null
    UNION ALL
    SELECT
    B1.string_field AS old_string_field,
    B2.string_field AS string_field,
    'B1' as match_type
    FROM
    tableb B1
    INNER JOIN tableb B2 ON B1.string_field <> B2.string_field AND B1.id1 = B2.id1
    WHERE
    B1.id1 is not null
    UNION ALL
    SELECT
    B1.string_field AS old_string_field,
    B2.string_field AS string_field,
    'B2' as match_type
    FROM
    tableb B1
    INNER JOIN tableb B2 ON B1.string_field <> B2.string_field AND B1.id1 = B2.id2
    WHERE
    B1.id1 is not null),
table1 AS (
    SELECT TOP 100 PERCENT /* Enables order by to improve join performance */
    old_new_string.old_string_field,
    old_new_string.string_field,
    old_new_string.match_type,
    comment_date = (SELECT max(comment_table.comment_date) FROM comment_table WHERE old_new_string.string_field = comment_table.string_field and comment_table.comment_code = '001')
    FROM
    old_new_string
    ORDER BY
    old_new_string.old_string_field)
SELECT
tablez.string_field as old_string_field, 
max(table2.task_date) as task_date, 
min(cast(getdate() - table2.task_date as bigint)) as Aging
table1.string_field as new_string_field, 
max(table1.match_type) as match_type, 
max(table1.comment_date) as comment_date, 
sort_order1 = (case when max(table1.comment_date) is null then 2 else 1 end), 
sort_order2 = (case when table1.string_field is null then 2 else 1 end) 
FROM 
tablez 
INNER JOIN table2 ON tablez.string_field = table2.string_field 
LEFT JOIN table1 on tablez.string_field = table1.old_string_field
Where 
table2.task_date IS NOT NULL
Group By 
tablez.string_field, table1.new_string_field  
ORDER BY 
(case when max(table1.comment_date) is null then 2 else 1 end) DESC,
(case when table1.string_field is null then 2 else 1 end) ASC,
max(table2.task_date) ASC

Answer 1

ORDER BY 
  case when max(table1.comment_date) is null then 2 else 0 end 
+ case when table1.string_field is null then 0 else 1 end DESC

或

ORDER BY CASE
   WHEN max(table1.comment_date) is null and table1.string_field is not null 
      THEN 0
   WHEN table1.string_field is null 
      THEN 1
   WHEN max(table1.comment_date) is not null and table1.string_field is not null 
      THEN 2
      ELSE 3 END