BigQuery JOIN错误

Question

我一直试图解决这个错误几个小时而没有任何运气，这是一个我已经运行数周而没有任何问题的查询，但突然间我看到了这个错误：

  

错误：ON子句必须为AND = =比较一个字段名称   每个表，所有字段名称都以表名为前缀。

查询的格式如下：

SELECT S.av AS av, S.dm AS dm, t, gn
FROM [dataset.cTable] 
JOIN EACH (SELECT id, av, dm FROM [dataset.sTable]) AS S ON S.id = sid  
AND (t == 'type1' OR t == 'type2')  GROUP EACH BY av, dm, t, gn;

非常感谢任何帮助。

Answer 1

(t == 'type1' OR t == 'type2')子句不是连接条件，它是where条件。如果您将查询更改为：

SELECT S.av AS av, S.dm AS dm, C.t, C.gn
FROM [dataset.cTable] C
JOIN EACH (SELECT id, av, dm FROM [dataset.sTable]) AS S ON S.id = sid  
WHERE (C.t == 'type1' OR C.t == 'type2')  GROUP EACH BY S.av, S.dm, C.t, C.gn;

它应该有用。

Answer 2

据推测，添加别名可以解决问题。我也不认为子查询是必要的：

SELECT S.av AS av, S.dm AS dm, c.t, c.gn
FROM [dataset.cTable] as c JOIN EACH 
     [dataset.sTable] AS S
     ON S.id = c.sid 
WHERE c.t in ('type1', 'type2') 
GROUP EACH BY av, dm, t, gn;

each可能没有必要，但我对Google BigQuery并不太熟悉。