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问题描述
下面的示例停止在第一行的JOIN处添加一条错误消息在第13行第4列遇到JOINJOIN b $ b
）
我在Bigquery中多次连接时丢失了什么明显的东西？
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赋值 JOIN SELECT wgt .Term， wgt.Weight FROM [Crosswalk.TermWeights] AS wgt ON wgt.Term = assign.Term ）加入 JOIN SELECT type.CourseCode， type.CourseDescription， type.CourseType， type.CourseCategory 从[Crosswalk.CourseTypeDescription] AS类型 ON joined.assign.StateCourseCode = type.CourseCode GROUP BY CourseType<我认为你只是错过了第13行的括号。
这个：
JOIN SELECT wgt.Term， wgt.Weight FROM [Crosswalk.TermWeights] AS wgt ON wgt.Term = assign.Term应该是：
JOIN（SELECT wgt.Term， wgt.Weight FROM [Crosswalk.TermWeights]）由于$ b $ $ b ON wgt.Term = assign.Term更多信息： developers.google/bigquery/docs/query-reference#multiplejoinsexample
仅供参考 - JOIN的速度并不像我们想要的那么快。我们正在努力提高性能。
The example below stops at the first JOIN with an error message
Encountered " "JOIN" "JOIN "" at line 13, column 4. Was expecting: ")"
Am I missing something obvious with multiple joins in Bigquery?
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解决方案
I think you're just missing a parenthesis on line 13.
This:
JOIN SELECT wgt.Term, wgt.Weight FROM [Crosswalk.TermWeights] AS wgt ON wgt.Term = assign.TermShould be:
JOIN (SELECT wgt.Term, wgt.Weight FROM [Crosswalk.TermWeights]) AS wgt ON wgt.Term = assign.TermMore info: developers.google/bigquery/docs/query-reference#multiplejoinsexample
FYI - JOINs are not as fast as we'd like yet. We're working on improving the performance.
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在Google bigquery中加入3个表格
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