[英]Query “is valid” but produces an error: Scalar subquery produced more than one element
This query “is valid” according to the BigQuery SQL editor. 根据BigQuery SQL编辑器,此查询“有效”。 However when it is run, it produces an error:Scalar subquery produced more than one element 但是,当它运行时会产生一个错误:标量子查询产生了多个元素
Input: 输入:
SELECT
(Select
pcr.repdte
from
usa_fdic_call_reports_1992.All_Reports_19921231_
Performance_and_Condition_Ratios as PCR) as Quarter,
(SELECT
Round(PCR.lnlsdepr)
FROM
usa_fdic_call_reports_1992.All_Reports_19921231_Performance_
and_Condition_Ratios as PCR) as NetLoansAndLeasesToDeposits,
(SELECT LD.IDdepsam
FROM usa_fdic_call_reports_1992.All_Reports_19921231_
Deposits_Based_on_the_dollar250_000_Reporting_Threshold
AS LD) as DepositAccountsWithMoreThan250k
Output Scalar subquery produced more than one element 输出标量子查询产生了多个元素
The output of the queries when they are run independently is below: 当它们独立运行时,查询的输出如下:
SELECT
PCR.repdte as quarter
FROM
usa_fdic_call_reports_1992.All_Reports_19921231_
Performance_and_Condition_Ratios as PCR
SELECT
Round(PCR.lnlsdepr) as NetLoansAndLeasesToDeposits
FROM
usa_fdic_call_reports_1992.All_Reports_19921231_
Performance_and_Condition_Ratios as PCR
SELECT LD.IDdepsam as DepositAccountsWithMoreThan250k
FROM
usa_fdic_call_reports_1992.All_Reports_
19921231_Deposits_Based_on_the_dollar250_000_
Reporting_Threshold AS LD
Scalar subqueries cannot produce more than a single row . 标量子查询最多只能产生一行 。 You are showing your scalar subqueries show a single column , and multiple rows . 您正在显示标量子查询显示单列和多行 。 That -- by definition -- won't work. 从定义上来说,那是行不通的。
I solved the problem by not using a subquery, and instead using JOIN 我通过不使用子查询,而是使用JOIN解决了问题
SELECT
pcr.cert as cert,
pcr.name as NameOfBank,
pcr.repdte as Quarter,
Round(PCR.lnlsdepr) as NetLoansAndLeasesToDeposits,
LD.IDdepsam as DepositAccountsWithMoreThan250k
FROM
usa_fdic_call_reports_1992.All_Reports_19921231_Performance
_and_Condition_Ratios as PCR
JOIN
usa_fdic_call_reports_1992.All_Reports_19921231_Deposits_Based_
on_the_dollar250_000_Reporting_Threshold AS LD
ON PCR.cert = LD.cert
To fix, use ARRAY
. 要修复,请使用ARRAY
。
For example, this query works: 例如,此查询有效:
SELECT 1 x, (SELECT y FROM UNNEST(SPLIT("1")) y) y
But this one will give you the stated error: 但这会给您陈述的错误:
SELECT 1 x, (SELECT y FROM UNNEST(SPLIT("1,2")) y) y
"Scalar subquery produced more than one element"
And I can fix it with ARRAY()
, that will produce nested repeated results: 我可以使用ARRAY()
修复它,这将产生嵌套的重复结果:
SELECT 1 x, ARRAY(SELECT y FROM UNNEST(SPLIT("1,2")) y) y
Or make sure to emit only one row, with LIMIT
: 或确保只发出一行,并加上LIMIT
:
SELECT 1 x, (SELECT y FROM UNNEST(SPLIT("1,2")) y LIMIT 1) y
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