mysql - 如何计算名字以a,b,c......开头的员工的sal？

Question

create table Emp(emp_name varchar(20),emp_sal int)

insert into Emp values
('amit',100),('animesh',200),('ashish',300),('ashok',400),
('ramesh',500),('ratan',600),('rajesh',700),
('lokesh',300),('lalit',900),('lakhan',800)

Can i calculate sum of the salary of employees whose name starts with 'A', 'R', 'L' and Even I want it show in table with a unique id like

emp_id         total_sal
 A               1000
 R               1800
 L               2000

I have tried like this

select sum(emp_sal)as from emp where emp_name like 'a%'

but dont know what to do next

Answer 1

SELECT LEFT(emp_name, 1) first_letter, sum(emp_sal)
  FROM emp
  WHERE LEFT(emp_name, 1) IN ('a', 'r', 'l')
  GROUP BY LEFT(emp_name, 1);

这里的 fiddle 示例:http://sqlfiddle.com/#!9/436b8/2

并且适用于 mysql 和 sql-server。