0

以下の例は、最初のJOINで停止し、エラーメッセージが表示されます

13行4列目で""JOIN "" JOIN ""に遭遇しました。期待していた： "）"

Bigqueryの複数の結合で明らかな何かが欠けていますか？

SELECT type.CourseType AS CourseType, 
       SUM(joined.assign.StudentCount) AS StudentN
FROM
  (
   SELECT assign.StateCourseCode,
          assign.StateCourseName,
          assign.MatchType, 
          assign.Term, 
          assign.StudentCount

   FROM [Assignment.AssignmentExtract5] AS assign

   JOIN SELECT wgt.Term,
               wgt.Weight 

    FROM [Crosswalk.TermWeights] AS wgt
     ON wgt.Term = assign.Term

 ) AS joined

JOIN SELECT type.CourseCode,
            type.CourseDescription, 
            type.CourseType, 
            type.CourseCategory 

FROM [Crosswalk.CourseTypeDescription] AS type
  ON joined.assign.StateCourseCode = type.CourseCode

GROUP BY CourseType
4

2 に答える 2

2

ライアンに感謝します、あなたの助けは大いに感謝されました。興味があるかもしれない人のために、ここにうまくいったクエリがあります。 

SELECT type.CourseCategory AS CourseCategory, 
       SUM(joined.assign.StudentCount) AS StudentN
    FROM
      (
       SELECT assign.StateCourseCode,
              assign.StateCourseName,
              assign.MatchType, 
              assign.Term, 
              assign.StudentCount

       FROM [Assignment.AssignmentExtract5] AS assign

       JOIN (SELECT Term,
                    Weight 

       FROM [Crosswalk.TermWeights]) AS wgt
       ON wgt.Term = assign.Term

     ) AS joined

    JOIN (SELECT CourseCode,
                 CourseDescription, 
                 CourseType, 
                 CourseCategory 

      FROM [Crosswalk.CourseTypeDescription]) AS type
    ON (joined.assign.StateCourseCode = type.CourseCode)

    GROUP BY CourseCategory;
于 2012-09-09T06:19:15.577 に答える
1

13行目の括弧が欠落していると思います。

これ：

   JOIN SELECT wgt.Term,
               wgt.Weight 

    FROM [Crosswalk.TermWeights] AS wgt
     ON wgt.Term = assign.Term

する必要があります：

   JOIN (SELECT wgt.Term,
               wgt.Weight 

    FROM [Crosswalk.TermWeights]) AS wgt
     ON wgt.Term = assign.Term

詳細： https ：//developers.google.com/bigquery/docs/query-reference#multiplejoinsexample

参考までに-JOINはまだ私たちが望むほど速くはありません。パフォーマンスの向上に取り組んでいます。

于 2012-09-08T23:28:07.260 に答える