根据其他 join table 列计算一个字段的总和

Question

我正在处理这样的 SQL 查询：

Select 
    a.field1,
    b.field2,
    c.field3,
    c.field4,
    b.filed5,
    a.field6,
    COALESCE(SUM(d.paid_amt) OVER (PARTITION BY a.some_column), 0)  as amount_paid 
from 
    a 
inner join 
    b on a.field1 = b.field1 
right join 
    c on b.field2 = c.field3 
left join 
    d on d.filed3 = a.field1 and d.field8 = a.field3
where 
    some conditions;

上面的输出是这样的：

field1 | field2 | field3 | field4 | field5 | field6 | amount_paid
-------+--------+--------+--------+--------+--------+-------------
name   | value1 | other1 | 1      | diff   |   new  | 100
name1  | value2 | other2 | 1      | diff1  |   new1 | 100
name2  | value3 | other3 | 2      | diff2  |   new2 | 100

我需要在结果中添加一个新列，它根据 field4 值（如果它们相同）对 amount_paid 求和。

上面的查询返回如下：

field1 | field2 | field3 | field4 | field5 | field6 | amount_paid
-------+--------+--------+--------+--------+--------+-------------
name   | value1 | other1 | 1      | diff   |   new  | 200
some   | value3 | other3 | 2      | diff2  |   new2 | 200

但预期结果如下：

field1 | field2 | field3 | field4 | field5 | field6 | amount_paid
-------+--------+--------+--------+--------+--------+-------------
name   | value1 | other1 | 1      | diff   |   new  | 200
some   | value3 | other3 | 2      | diff2  |   new2 | 100

请提供任何有用的建议。

Answer 1

你似乎只想：

Select . . .
       COALESCE(SUM(d.paid_amt) OVER (PARTITION BY c.field04), 0)  as amount_paid

根据其他 join table 列计算一个字段的总和

Calculating the sum of a field based on other join table columns

sql

postgresql

join

left-join

right-join