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时间限制:1秒 空间限制:32768K
题目描述
统计出当前各个title类型对应的员工当前薪水对应的平均工资。结果给出title以及平均工资avg。
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`));
CREATE TABLE IF NOT EXISTS "titles" (
`emp_no` int(11) NOT NULL,
`title` varchar(50) NOT NULL,
`from_date` date NOT NULL,
`to_date` date DEFAULT NULL);
输入描述:
无
输出描述:
title | avg |
---|---|
Engineer | 94409.0 |
Senior Engineer | 69009.2 |
Senior Staff | 91381.0 |
Staff | 72527.0 |
输入
无
输出
无
我的代码
运行时间:17ms 占用内存:3428k
SELECT title,AVG(salary) AS avg
FROM salaries, titles
WHERE salaries.emp_no = titles.emp_no
AND DATE(salaries.to_date) = '9999-01-01'
AND DATE(titles.to_date) = '9999-01-01'
GROUP BY title;