加入不同的列名和同一行的兩個表

Question

我有一個表1：

|age | name | sex | money | 
------------------------------- 
|20 | James | 1 | 1000 | 
|20 | Marry | 2 | 2000 | 
|20 | Kate | 2 | 1500 | 
|20 | Parker | 1 | 1800 | 

而且我有兩個查詢結果：

1：

select `age`, count(*) as `man`, sum(money) as man_money 
from table1 
where `sex` = 1 and age = 20; 

|age| man | man_money | 
------------------------- 
|20 | 2  | 2800  | 

2：

select `age`, count(*) as `woman`, sum(money) as woman_money 
from table1 
where `sex` = 2 and age = 20; 

|age |woman | woman_money | 
----------------------------- 
|20 |2  | 3500  | 

我想結合r結果如下：

|age | man | woman | man_money | woman_money | 
-------------------------------------------------- 
|20 | 2  | 2  | 2800  | 3500  | 

如何編寫SQL？

Answer 1

試試這個：

select age, 
     count(case when sex = 1 then 1 end) as man, 
     count(case when sex = 2 then 1 end) as woman, 
     sum(case when sex = 1 then money end) as man_money, 
     sum(case when sex = 2 then money end) as woman_money 
from table1 
where age = 20 

Answer 2

我不知道MySQL，但是就我所知的SQL是同樣爲所有的數據庫，我在Oracle嘗試這樣它的作品，因爲你需要

select age, 

     count(case when sex = 1 then 1 end) as man, 

     count(case when sex = 2 then 1 end) as woman 

from table1 group by age;