插入SELECT GROUP BY:目标列多于表达式错误 [英] INSERT a SELECT GROUP BY : more target columns than expressions error

问题描述

我有一个要查询的查询，它是从SELECT GROUP BY插入的，但出现错误:

I have a query, that I want to make, it is an INSERT FROM a SELECT GROUP BY, but I get the error:

错误:INSERT具有比表达式更多的目标列
第15行:插入"KPI_MEASURE"(id，created_at，kpi_project_id，k ...
_____________________________________ ^
提示:插入源是一个行表达式，包含与INSERT期望的列数相同的列.您是否不小心使用了多余的括号?

ERROR: INSERT has more target columns than expressions
LINE 15: INSERT INTO "KPI_MEASURE" (id, created_at, kpi_project_id, k...
_____________________________________^
HINT: The insertion source is a row expression containing the same number of columns expected by the INSERT. Did you accidentally use extra parentheses?

我已经搜索了此错误，但是我发现的是，如果行数不匹配，则会发生此错误，但是对于下面的查询，行数是相同的.
Postgres SQL查询:

I've searched this error, but what I found is that, this error happen, if the number of rows doesn't match, but for the query below, there is the same number of row.
Postgres SQL query:

INSERT INTO "KPI_MEASURE" (
        id,
        created_at,
        kpi_project_id,
        kpi_frequency_id,
        kpi_metric_id,
        branch,
        value
    )
SELECT (
        nextval('"KPI_MEASURE_ID_seq"'::regclass),
        now(),
        kpi_project.id,
        kpi_measure.kpi_frequency_id,
        kpi_metric.id ,
        kpi_measure.branch ,
        sum(kpi_measure.value)
    )
FROM "KPI_MEASURE" kpi_measure
    INNER JOIN "KPI_METRIC" kpi_metric                      ON kpi_measure.kpi_metric_id = kpi_metric.id
    INNER JOIN "KPI_PROJECT" kpi_project                    ON kpi_measure.kpi_project_id = kpi_project.id
    INNER JOIN "KPI_AGGREGATION_PROJECT" kpi_agg_project    ON kpi_project.name = kpi_agg_project.child_project_name
    WHERE kpi_metric.aggregated = false
GROUP BY kpi_measure.branch, kpi_metric.id, kpi_project.id, kpi_project.name, kpi_frequency_id;

推荐答案

将表达式括在括号中时，Postgres会将结果解释为元组-本质上是结构或记录.

When you enclose expressions in parentheses, Postgres interprets the result as a tuple -- essentially a struct or record.

因此，您的声明:

SELECT (
        nextval('"KPI_MEASURE_ID_seq"'::regclass),
        now(),
        kpi_project.id,
        kpi_measure.kpi_frequency_id,
        kpi_metric.id ,
        kpi_measure.branch ,
        sum(kpi_measure.value)
     )

返回一个值.该值是一条记录.

is returning one value. That value is a record.

不支持元组的数据库将返回错误.

Databases that do not support tuples would return an error.

解决方案是删除括号.

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