1, Title Description
Find salary rose more than 15 times the number of employees and its corresponding number emp_no rose t
the CREATE TABLE `salaries` (
` emp_no` int (11) the NOT NULL,
`salary` int (11) the NOT NULL,
` from_date` the NOT NULL DATE,
DATE to_date` the NOT NULL `,
a PRIMARY KEY (emp_no``, `from_date`));
the CREATE TABLE `salaries` (
` emp_no` int (11) the NOT NULL,
`salary` int (11) the NOT NULL,
` from_date` the NOT NULL DATE,
DATE to_date` the NOT NULL `,
a PRIMARY KEY (emp_no``, `from_date`));
Enter a description:
no
Output Description:
| emp_no | t |
|---|---|
| 10001 | 17 |
| 10004 | 16 |
| 10009 | 18 |
2、
select emp_no,count(1) as t
from salaries
group by emp_no having count(1)>15;
The difference between (1) Find count (*) and count: Note