有人暗示我如何将四个列的值放入Google BigQuery的新列中？标准SQL方言。不是遗产。如果我尝试concat（在select语句中或作为subselect）
SELECT
Concat (visitId,fullVisitorId,visitNumber) as identifier,
...
FROM ...
SELECT
(SELECT Concat(visitId,fullVisitorId,visitNumber) as identifier FROM ...),
...
FROM ...
我收到如下错误消息：
Error: No matching signature for function CONCAT for argument types: INT64, STRING, INT64. Supported signatures: CONCAT(STRING, [STRING, ...]); CONCAT(BYTES, [BYTES, ...]) at [5:3]
如果有人可以帮助我，那就太好了。谢谢。