从一组数据中创建多个字段的汇总报告

Question

我有个任务编写SQL来总结出如下数据：

select 
payment, 
status, 
interest, 
principal 
from payment 

---

payment status interest principal 
1  A  100   0 
2  r  0   500 
3  o  0   400 
4  d  0   100 
5  A  0   200 
6  A  200   0 
7  A  300   0 
8  A  0   300 

• 与利息支付会如果利息不为0
• 与本金有关的付款将是本金不为0的地方
• 需要拆分数据进入型

我找的结果与此类似：

    Interest total count   principal total count 
Status - A    3       1 
Other     0       4 
total of all payments 3       5 

我一直在使用组功能，但一直没能超越利息金额集团。任何建议将不胜感激。

Answer 1

为此，我建议使用GROUP BY + WITH ROLLUP。喜欢的东西：

SELECT 
    IF(`status` = 'A', 'Status A', 'Others') as `-`, 
    SUM(`interest` > 0) as `Interest total count`, 
    SUM(`principal` > 0) as `principal total count` 
FROM 
    (
     SELECT 1 as `payment`, 'A' as `status`, 100 as `interest`, 0 as `principal` 
     UNION ALL 
     SELECT 2, 'r', 0, 500 
     UNION ALL 
     SELECT 3, 'o', 0, 400 
     UNION ALL 
     SELECT 4, 'd', 0, 100 
     UNION ALL 
     SELECT 5, 'A', 0, 200 
     UNION ALL 
     SELECT 6, 'A', 200, 0 
     UNION ALL 
     SELECT 7, 'A', 300, 0 
     UNION ALL 
     SELECT 8, 'A', 0, 300 
    ) as `sub` 
GROUP BY 1 WITH ROLLUP; 

结果：

-  Interest total count principal total count 
Others   0      3 
Status A  3      2 
       3      5 

查询：

SELECT 
    IF(`status` = 'A', 'Status A', 'Others') as `-`, 
    SUM(`interest` > 0) as `Interest total count`, 
    SUM(`principal` > 0) as `principal total count` 
FROM 
    `payment` 
GROUP BY 1 WITH ROLLUP;