SQL 分组无效。

Question

我有一个很长的 SQL 项目列表，我需要做的是根据其中的两个项目进行分组 --

例如：

select distinct 
a.customer_no   ,
a.customer_prefix   ,
a.customer_lname    ,
a.customer_street1
... -- about 100 other rows 
a.inv_mail_dt,
a.pmt_due_dt,
a.pmt_rcvd_dt,
a.pmt_rcvd_amt,
a.perf_date,
a.perf_desc,
a.sub_line_item_price_type_desc ,
a.Price_type_desc,
sum(a.sli_due_amt),
sum(a.sli_paid_amt)
from VIEW a
Where a.customer_no = @customer_no
Group by 
a.customer_no,
a.order_no,
a.Price_type_desc

但我不断收到错误消息，要求我将其他 columns/fields 添加到分组依据。但是，如果它们是唯一的，则不应使用它们进行分组，如果它们相同，则它们应该分开

Answer 1

But those [columns] shouldn't be used to group by if they are unique then they should be separate if they are the same

那不是 GROUP BY 的工作方式。您在 select 中指定的每个表达式必须是以下两种之一：

A GROUP BY 列 - 即来自 GROUP BY 列表的列，或
聚合表达式 - 即 selects MIN, MAX, SUM, [=17 的函数=]，等等

GROUP BY 查询将使用 "group by" 列将结果拆分为 "buckets"，在每个单独的存储桶内执行聚合，并将结果 return 提供给您。

由于向 GROUP BY 列表中添加更多列可能会导致创建比您需要的更多的存储桶，解决此问题的另一种方法是完全删除未使用的列，运行 a GROUP BY 和 "flat" 分别查询，并在 RDBMS 或主机环境中加入结果：

select distinct 
    a.customer_no,
    a.order_no,
    a.Price_type_desc,
    a.customer_prefix,
    a.customer_lname,
    a.customer_street1
    ... -- about 100 other rows 
    a.inv_mail_dt,
    a.pmt_due_dt,
    a.pmt_rcvd_dt,
    a.pmt_rcvd_amt,
    a.perf_date,
    a.perf_desc,
    a.sub_line_item_price_type_desc,
    x.sum_sli_due_amt,
    x.sum_sli_paid_amt
from VIEW a
join (
    SELECT
    b.customer_no,
    b.order_no,
    b.Price_type_desc,
    sum(b.sli_due_amt) as sum_sli_due_amt,
    sum(b.sli_paid_amt) as sum_sli_paid_amt
    from VIEW b
    Group by 
    b.customer_no,
    b.order_no,
    b.Price_type_desc
   Where b.customer_no = @customer_no
) x ON a.customer_no=x.customer_no
   AND a.order_no=x.order_no
   AND a.Price_type_desc=x.Price_type_desc
Where a.customer_no = @customer_no

SQL 分组无效。

SQL Group by Not working.

mysql

sql

group-by

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