Mysql减去一列的总和到其他

Question

一列，我有两列Test1和Test2我想Test1 - Test2我尝试这个但不起作用

SELECT (select sum(Test1) FROM test_table)
- 
select (SELECT sum(Test2) FROM test_table) 
from test_table

Answer 1

这是正确的语法：

SELECT sum(Test1)- sum(Test2)
FROM test_table