如何在t-sql中折叠空值上的行？ [英] How Do I collapse rows on null values in t-sql?

问题描述

我的查询很奇怪。我的目标是显示每个人的多次交易中的总存款和取款并显示它们。我得到多行，需要折叠成一排。所有这些都需要在一个查询中发生

I'm in a weird situation with my query. My objective is to display the total deposits and withdrawals from multiple transactions for each person and display them. I am getting multiple rows that I need to collapse into one. This all needs to happen in one query

SELECT
       lastname,
       firsname,
       case when upper(category) = 'W' then sum(abs(principal)) end as Withdrawal,
       case when upper(category) = 'D' then sum(abs(principal)) end as Deposit,
       description
FROM
       table1 
       JOIN table2 ON table1.id = table2.id 
       JOIN table3 ON table2.c = table3.c 
WHERE 
       description = 'string'
GROUP BY
       lastname,
       firstname,
       description,
       category

我的结果是

 lastname    firstname    Withdrawal    Deposit    description
 john         smith       null           140.34    string
 john         smith       346.00          null     string
 jane         doe         null           68.03     string
 jane         doe         504.00          null     string

我正在寻找

 lastname    firstname    Withdrawal    Deposit    description
 john         smith       346.00        140.34     string
 jane         doe         504.00        68.03      string

将主体添加到组中不会工作。

adding principal into the group does not work. any help on solving this will be greatly appreciated!

推荐答案

使用条件聚合，将不胜感激。 。 。 case 是 sum（）的参数：

Use conditional aggregation . . . the case is the argument to the sum():

select lastname, firsname,
       sum(case when upper(category) = 'W' then abs(principal) end) as Withdrawal,
       sum(case when upper(category) = 'D' then abs(principal) end) as Deposit, 
       description
from table1 join
     table2
     on table2.id = table1.id join
     table3 
     on table3.c = table2.c
where description = 'string'
group by lastname, firstname, description

这篇关于如何在t-sql中折叠空值上的行？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！