BigQuery - operator = 参数类型没有匹配的签名：INT64，STRING

Question

Im getting a weird error(Maybe im getting this error for the first time) from BQ.

No matching signature for operator = for argument types: INT64, STRING. 
Supported signatures: ANY = ANY at [27:1]

Query:

SELECT col1
    ,col2
    ,col3
FROM tbl1
JOIN t2 ON t1.id = t2.id
JOIN t3 on t2.id = t3.id
JOIN t4 on t4.id = t1.id

Error line JOIN t2.id = t3.id t2.id is showing this error.

its an integer column.

Answer 1

One of your comparisons is mixing types. This is a bad idea -- as the error message shows. You need to find out which pair (or pairs) and do one of the following:

cast(t2.id as string) = t3.id
t2.id = safe.cast(t3.id as int64)

Answer 2

In my case this is due to syntax error. So to solve this just copy the generated query and paste it in bigquery then you will know what is wrong.

Answer 3

In your query you created join with t2 table but t3 and t4 table names are not given in join. Below is the correct query.

SELECT col1
    ,col2
    ,col3
FROM tbl1 as t1
JOIN t2 ON t1.id = t2.id
JOIN t3 ON t2.id = t3.id
JOIN t4 ON t4.id = t1.id

Try this. I think this will work.

After Edit

you need to give table name with field in select fields like

select 
    t1.field1, 
    t2.field1, 
    t3.field3, 
    t4.field 
From tbl1 as t1
JOIN t2 ON t1.id = t2.id
JOIN t3 ON t2.id = t3.id
JOIN t4 ON t4.id = t1.id