Question

我有一堆带有一堆列的表。三列是整数，标记为消耗，消耗2和消耗3。

我想选择表格的每一行，但是按三个消费字段的总和来减少选择。

我可以按每个消费栏单独订购

order by consumption3 desc, consumption 2 desc, consumption desc

但我更愿意将这些值相加，然后按该总和值排序。

我也可以编写一个4GL程序来执行此操作，但我尝试在SQL中解决此问题。

如果我这样做，

select  *
from    ws_bill
order by sum(consumption) + sum(consumption2) + sum(consumption3)

然后Informix的SQL需要group by列表中的每一列。

有没有更简单的方法，或者我应该只编写程序？

在Ubuntu 12.04上运行的Informix SE / 4GL版本

ics@steamboy:~/icsdev$ dbaccess -V
DB-Access Version 7.25.UC6R1 
Software Serial Number ACP#J267193
ics@steamboy:~/icsdev$ fglpc -V

Pcode Version 732-750

Software Serial Number ACP#J267193
ics@steamboy:~/icsdev$

这是表格：

create table "ics".ws_bill 
  (
    yr char(2),
    bill_no integer,
    bill_month smallint,
    due_date date,
    tran_date date,
    prev_reading integer,
    curr_reading integer,
    consumption integer,
    consumption2 integer,
    consumption3 integer,
    water_charge money(10,2),
    sewer_charge money(10,2),
    other_charge decimal(10,2),
    curr_bal money(10,2),
    estimated char(1),
    prev_due_date date,
    time_billed datetime year to second,
    override char(1),
    curr_bal_save money(10,2)
  );
revoke all on "ics".ws_bill from "public";

create unique index "ics".ws_indx on "ics".ws_bill (bill_no,yr,
    bill_month);

这是主要光标，如本帖所接受的答案所示。

declare wb_cp cursor for
select  b.yr,b.bill_no,
        sum(b.consumption + b.consumption2 + b.consumption3) as adj_tot
into    cons_rec.* #defined record variable
from    ws_bill b
where   b.yr >= start_yearG and b.yr <= end_yearG
group   by b.yr, b.bill_no
order by adj_tot desc, b.yr desc, b.bill_no desc

Answer 1

你在谈论总结三列。这是一个简单的表达式（消费+消费2 +消费3）。除非要对要分组的多个行求和，否则不需要sum（...）函数。

所以，你需要这些内容：

select bill_no, bill_month, ..., (consumption + consumption2 + consumption3) as tot_sum
  from ws_bill
 order by tot_sum desc

Answer 2

select  *, (sum(consumption) + sum(consumption2) + sum(consumption3)) as tot_sum
from ws_bill
order by tot_sum desc

Answer 3

您使用的是哪个版本的informix？假设您的表具有唯一标识符并且您的informx版本支持子查询，请尝试：

SELECT *
FROM ws_bill w 
   JOIN (
      SELECT id, sum(consumption) + sum(consumption2) + sum(consumption3) as tot
      FROM ws_bill
      GROUP BY id
   ) w2 on w.id = w2.id
ORDER BY tot DESC

祝你好运。

如何通过函数（总和）的结果来订购选择？

3 个答案: