Question

我有Informix代码：

select data as DATA from (
(select distinct('Date|Message_Type|Total') as data,0 as sort from dual)
union
(select 'dt: '||day||'|'||trim(msg_type)||'|'||nvl(round(total,2),0) as data,1 as sort from weekly_report_1)
                 )order by sort)

输出：

data1
Date|Message_Type|Total
dt: 02/10/2015|1440|0.00
dt: 02/10/2015|Total|-26290965.84
dt: 02/11/2015|1240|-23550538.87
dt: 02/11/2015|1440|0.00
dt: 02/11/2015|Total|-23550538.87
dt: 02/10/2015|1240|-26290965.84
dt: 02/12/2015|1240|-24181913.23
dt: 02/14/2015|Total|0.00
dt: 02/12/2015|1440|0.00
dt: 02/12/2015|Total|-24181913.23
dt: 02/13/2015|1240|-24611999.80
dt: 02/13/2015|1440|0.00
dt: 02/13/2015|Total|-24611999.80
dt: 02/14/2015|1240|0.00
dt: 02/14/2015|1440|0.00

当我尝试执行以下操作时：

select * from(
select data as DATA1 from (
(select distinct('Date|Message_Type|Total') as data,0 as sort from dual)
union
(select 'dt: '||day||'|'||trim(msg_type)||'|'||nvl(round(total,2),0) as data,1 as sort from weekly_report_1)
                 )order by sort) order by DATA1;

我得到了：

错误：常规错误。语法错误（状态：37000，本机代码：FFFFD4CC）

我需要对表格进行排序。

Answer 1

您只能拥有一个ORDER BY子句。您不需要第二级子查询。

SELECT data AS Data1 
  FROM (SELECT DISTINCT('Date|Message_Type|Total') AS Data,
               0 AS Sort
          FROM dual
        UNION
        SELECT 'dt: '||day||'|'||trim(msg_type)||'|'||nvl(round(total,2),0) AS Data,
               1 AS Sort
          FROM weekly_report_1
       ) AS AnyName
ORDER BY Sort, Data1;

除非您有一个严重过时的（更换多年的替换版）Informix版本，否则您可以按照列表中的列表进行排序。如果你确实有一个足够古老的Informix版本，这不起作用，你也需要选择Sort值。或者，您可以依赖于您正在使用的代码集中Date之前的dt，只需忽略Sort上的排序。

按单列排序

1 个答案: