查找薪水涨幅超过15次的员工号emp_no以及其对应的涨幅次数t

查找薪水涨幅超过15次的员工号emp_no以及其对应的涨幅次数t
CREATE TABLE salaries (
emp_no int(11) NOT NULL,
salary int(11) NOT NULL,
from_date date NOT NULL,
to_date date NOT NULL,
PRIMARY KEY (emp_no,from_date));

答案：

select emp_no,count(*) as t from salaries
group by emp_no
having t>15