2

サブクエリから返された結果の総数を取得しようとしています。これは私の質問です：

select 
    count(r.reason_id) as num,
    cast (count(r.reason_id) as float) / (select count(*) as total from r) * 100.0 as pct
from (
    select
        case
            when rarreason != 0 then rarreason
            else rejectreason end as reason_id
    from 
        workorderlines 
    where
        (rarreason != 0 or rejectreason != 0)
    ) as r

group by
    r.reason_id

ただし、これを実行しようとすると、次のエラーが発生します。

ERROR:  relation "r" does not exist
LINE 3: ...on_id) as float) / (select count(*) as total from r) * 100.0...
                                                             ^

********** Error **********

ERROR: relation "r" does not exist
SQL state: 42P01
Character: 112

どうすればよいですか？Postgresql9.1を使用しています。ありがとう！

4

2 に答える 2

1

試す：

select 
    count(r.reason_id) as num,
    cast (count(r.reason_id) as float) / max(r.count_all) * 100.0 as pct
from (
    select
        case
            when rarreason != 0 then rarreason
            else rejectreason end as reason_id,
        count(*) over () as count_all
    from 
        workorderlines 
    where
        (rarreason != 0 or rejectreason != 0)
    ) as r

group by
    r.reason_id
于 2013-02-13T18:50:48.473 に答える
1

ロジックをチェックしませんでしたが、次のように再配置できます。

with r as (
    select
        case
            when rarreason != 0 then rarreason
            else rejectreason end as reason_id
    from 
        workorderlines 
    where
        (rarreason != 0 or rejectreason != 0)
)
select 
    count(r.reason_id) as num,
    cast (count(r.reason_id) as float) / (select count(*) as total from r) * 100.0 as pct
from r
group by r.reason_id
于 2013-02-13T18:51:05.387 に答える