范围内未找到 H2 SQL 查询列

Question

关于：SQL: Find unavailability per minute of a ressource in an appointment

((点击以上链接查看架构+信息))

我正在尝试在 H2 SQL 数据库中运行此查询。我对 H2 语法有点不熟悉。我注意到导致问题的 WHERE 子句中的列 num。

错误：

未找到列“NUM”； SQL 语句： 创建力视图（ 选择 "A"."APPOINTMENT_ID", "A"."APPOINTMENT_START_TIME", "A"."APPOINTMENT_END_TIME", "C"."COMPONENT_HOST_NAME", “不可用”作为“状态” 来自“公众”。“任命”“A” 左外连接“公共”。“APPOINTMENT_COMPONENT”“AC” ON "A"."APPOINTMENT_ID" = "AC"."APPOINTMENT_ID" 内连接“公共”。“组件”“C” ON "C"."COMPONENT_ID" = "AC"."COMPONENT_ID" WHERE ((CONVERT("A"."APPOINTMENT_START_TIME", TIME) = DATEADD('minute', "NUM", CAST('00:00:00' AS TIME)))) AND ("C"."COMPONENT_ID" IN(1)) 仅获取第一行 ） 作为 选择 "A"."APPOINTMENT_ID", "A"."APPOINTMENT_START_TIME", "A"."APPOINTMENT_END_TIME", "C"."COMPONENT_HOST_NAME", “不可用”作为“状态” 来自“公众”。“任命”“A” 左外连接“公共”。“APPOINTMENT_COMPONENT”“AC” ON "A"."APPOINTMENT_ID" = "AC"."APPOINTMENT_ID" 内连接“公共”。“组件”“C” ON "C"."COMPONENT_ID" = "AC"."COMPONENT_ID" WHERE ((CONVERT("A"."APPOINTMENT_START_TIME", TIME) = DATEADD('minute', "NUM", CAST('00:00:00' AS TIME)))) AND ("C"."COMPONENT_ID" IN(1)) 仅获取第一行 [42122-200] 42S22/42122（帮助）

---

我的代码：

with times(num) as 
(
  select 30 as num
  union all select (num + 30)
  from times where num < (24*60)
)
select dateadd('minute', num, cast('00:00:00' as time)) as datetimeinterval, unavailabilities.state from times
outer join(
select top 1 a.appointment_id, a.appointment_start_time, a.appointment_end_time, c.component_host_name, 'unavailable' as state
    from  appointment a 
    left join appointment_component ac on a.appointment_id = ac.appointment_id
    inner join component c on c.component_id = ac.component_id
    where
            dateadd('minute', -->num<--, cast('00:00:00' as time)) between convert(a.appointment_start_time, time) and convert(a.appointment_end_time, time)
    and 
        c.component_id in (1)
) unavailabilities 

TLDR：尝试按分钟或按分钟范围（此处为 30 分钟）获取组件列表的不可用性。在这种情况下，Num 应该返回 30 的倍数，具体取决于选择的时间范围，它将检查组件是否被使用。

注意我从上面的链接更改了 machine=component 和 appmach=appointment_component（交叉表）

Answer 1

我不确定语法。我对H2不是很熟悉。但是 num 不应该在 on 子句而不是 subquery 中使用吗？请检查：

with recursive times(num) as 
(
  select 30 as num
  union all select (num + 30)
  from times where num < (24*60)
)
select dateadd('minute', num, cast('00:00:00' as time)) as datetimeinterval, unavailabilities.state from times
outer join(
select top 1 a.appointment_id, a.appointment_start_time, a.appointment_end_time, c.component_host_name, 'unavailable' as state
    from  appointment a 
    left join appointment_component ac on a.appointment_id = ac.appointment_id
    inner join component c on c.component_id = ac.component_id
    where
            dateadd('minute', -->num<--, cast('00:00:00' as time)) between convert(a.appointment_start_time, time) and convert(a.appointment_end_time, time)
    and 
        c.component_id in (1)


   ) unavailabilities 
on dateadd('minute', num, cast('00:00:00' as time)) between convert(appointment_start_time, time) and convert(appointment_end_time, time)