SQL 语法 JOIN google bigquery

Question

我在 Google BigQuery 中收到此错误：

Error: Ambiguous field reference in SELECT clause. (Remember to fully qualify all field names in the SELECT clause as <table.field>.)

我的查询是

SELECT LoanPerf1.loankey, Loans.Key
FROM   prosperloans1.LoanPerf1
JOIN   prosperloans1.Loans
       ON LoanPerf1.loankey = Loans.Key

prosperloans1 是数据集 ID 2个表名是正确的。 无论哪个字段名首先出现在 select 子句中，都会返回错误。

Google SQL Syntax 上的文档说这是正确的：

// Simple JOIN of two tables
SELECT table1.id, table2.username
FROM   table1
JOIN   table2
       ON table1.name = table2.name AND table1.id = table2.customer_id;

谢谢 肖恩

Answer 1

尝试在表名中添加 AS 子句：

SELECT LoanPerf1.loankey, Loans.Key FROM prosperloans1.LoanPerf1 as LoanPerf1 JOIN prosperloans1.Loans as Loans ON LoanPerf1.loankey = Loans.Key