用于多重值的结果子查询-SQL

Question

[当我在SUBQUERY中添加多个客户名称时，我从QUERY获得了反馈，但是，即使您仅输入一个值，即使使用IN条件，QUERY也可以正常工作

查询失败

SELECT "CUSTOMER",
    ( ( ( ( CAST(COUNT(*) AS FLOAT) ) - (
        SELECT
            (CAST(COUNT(*) AS FLOAT))
        FROM
            public.tbl_metrics
        WHERE
            "CUSTOMER" IN (
                'CLIENT1','CLIENT2','CLIENT3'
            )
            AND "STATUS" = 'NOT_TESTED'
        GROUP BY
            "STATUS",
            "CUSTOMER"
    ) ) / CAST(COUNT(*) AS INT) ) * 100) as "PERCENT", count("STATUS") as "OK"
FROM
    public.tbl_metrics
WHERE
    "CUSTOMER" IN (
        'CLIENT1','CLIENT2','CLIENT3'
    )
    AND "STATUS" = 'NOK'
GROUP BY
    "STATUS",
    "CUSTOMER"

成功查询

SELECT "CUSTOMER",
    ( ( ( ( CAST(COUNT(*) AS FLOAT) ) - (
        SELECT
            (CAST(COUNT(*) AS FLOAT))
        FROM
            public.tbl_metrics
        WHERE
            "CUSTOMER" IN (
                'CLIENT1'
            )
            AND "STATUS" = 'NOT_TESTED'
        GROUP BY
            "STATUS",
            "CUSTOMER"
    ) ) / CAST(COUNT(*) AS INT) ) * 100) as "PERCENT", count("STATUS") as "OK"
FROM
    public.tbl_metrics
WHERE
    "CUSTOMER" IN (
        'CLIENT1'
    )
    AND "STATUS" = 'NOK'
GROUP BY
    "STATUS",
    "CUSTOMER"

Answer 1

如果您的子查询返回多个结果，则该查询将显示错误，因为您进行的减法需要一行结果...当您请求多个客户时，您的子查询似乎至少返回2行

Answer 2

还不清楚“获得反馈”是什么意思？我猜您的子查询返回的行多（由于内部查询将多个客户分组=多个结果）。

我建议从一个简单的版本开始，使其正常运行，然后添加额外的计算（即百分比）。这是一个粗略的入门查询（不保证它能正常工作，因为我无权访问您的表，并且正在猜测这就是您希望完成的工作）。

SELECT met."CUSTOMER",
    ( SELECT COUNT(*)
        FROM
            public.tbl_metrics innerMet
        WHERE
            innerMet."CUSTOMER"= met."CUSTOMER"
            AND "STATUS" = 'NOT_TESTED'
    ) as "NOT_TESTED", count("STATUS") as "OK"
FROM
    public.tbl_metrics met
WHERE
    met."CUSTOMER" IN (
        'CLIENT1','CLIENT2','CLIENT3'
    )
    AND met."STATUS" = 'NOK'
GROUP BY
    met."STATUS",
    met."CUSTOMER"