google-bigquery - 在bigquery中联接多个表

Question

我希望能够在bigquery中加入多个表。加入两个很简单。

SELECT
t1.field1 AS field1,
t2.field2 AS field2,
t1.field3 AS field3
FROM [datasetName.tableA] t1
JOIN [datasetName.tableB] t2
ON t1.somefield = t2.anotherfield

但是，如果我想联接三个或更多表怎么办？我可以这样做吗

SELECT
t1.field1 AS field1,
t2.field2 AS field2,
t1.field3 AS field3,
t3.field4 as field4
FROM [datasetName.tableA] t1
JOIN [datasetName.tableB] t2
JOIN [datasetName.tableC] t3
ON t1.somefield = t2.anotherfield AND t1.somefield=t3.yetanotherfield

我已经尝试过了，但是没有用。我想我需要做些类似的事情

SELECT 
t12.field1 as field1,
t12.field2 as field2,
t3.field3 as field3,
FROM
(SELECT
t1.field1 AS field1,
t2.field2 AS field2,
t1.field3 AS field3
FROM [datasetName.tableA] t1
JOIN [datasetName.tableB] t2
ON t1.somefield = t2.anotherfield) t12
JOIN
[datasetName.tableC] t3
ON t12.field1 = t3.field1 

但是，有没有更简单的方法来实现这一目标？

谢谢，
布拉德

Answer 1

我认为您正在寻找类似以下的内容

SELECT
  t1.field1 AS field1,
  t2.field2 AS field2,
  t1.field3 AS field3,
  t3.field4 AS field4
FROM [datasetName.tableA] t1
JOIN [datasetName.tableB] t2 ON t1.somefield = t2.anotherfield
JOIN [datasetName.tableC] t3 ON t1.somefield = t3.yetanotherfield