MariaDB 10.4 不能多次使用 cte

Question

这是您可以使用的代码运行,

https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=74d081784b301ddfa8bf6d361c586693

with date_ranges(`start`, `end`, title) as (
    select  '2021-11-22', '2021-12-21 23:59:59', '1400-09'
    union all
    select '2021-12-22', '2022-01-20 23:59:59', '1400-10'
    union all
    select '2022-02-21', '2022-03-19 23:59:59', '1400-11'
),

     income as (
         select count(*) as input,
                dr.title as month
         from date_ranges dr
                  #join drivers u on u.created_at between dr.start and dr.end
         group by dr.title
     ),
     
          outcome as (
         select count(*) as input,
                ddr.title as month
         from date_ranges ddr
                  #join drivers u on u.created_at between ddr.start and ddr.end
         group by ddr.title
     )


select input, month
from  income i
order by month desc

上面的 link 运行良好，但我的本地数据库 MariaDB 10.4 报告错误

Unknown column 'ddr.title' in 'field list'

Answer 1

这是一个已知错误，已在最新版本的 MariaDB 中修复。

以下 fiddle 显示 10.4.22-MariaDB 未出现此问题，但我已验证 10.5.0-MariaDB-log 确实会产生错误，而 10.3.32-MariaDB、10.4 .22-MariaDB、10.5.13-MariaDB、10.6.5-MariaDB没有这个问题。

The fiddle

要解决此错误，我们可以在报告未知列的常用 table 表达式项的 select 列表中添加一个显式别名（派生列名称）。

注意，对于 date_ranges CTE 术语中第一个 UNION 术语的第 3 个 select 列表项，我通过 AS title 提供了派生列名称。这避免了错误。我们可以对报告为未知的任何类似列执行此操作。

调整后SQL：

with date_ranges(`start`, `end`, title) as (
    select  '2021-11-22', '2021-12-21 23:59:59', '1400-09' AS title
    union all
    select '2021-12-22', '2022-01-20 23:59:59', '1400-10'
    union all
    select '2022-02-21', '2022-03-19 23:59:59', '1400-11'
),
     income as (
         select count(*) as input,
                dr.title as month
         from date_ranges dr
                  #join drivers u on u.created_at between dr.start and dr.end
         group by dr.title
     ),
     
          outcome as (
         select count(*) as input,
                ddr.title as month
         from date_ranges ddr
                  #join drivers u on u.created_at between ddr.start and ddr.end
         group by ddr.title
     )

select input, month
from  income i
order by month desc
;

MariaDB 10.4 不能多次使用 cte

MariaDB 10.4 Can not use a cte more than once

sql

mariadb