MySql（五）select排序查询

举个栗子
/**查询员工信息，要求工资按照从高到低进行排序(默认升序)**/
SELECT * FROM employees ORDER BY salary ASC;
/**方法2：**/
SELECT * FROM employees ORDER BY salary;
/**查询部门标号大于等于90的员工信息，并且按照入职时间进行先后排序**/
SELECT * FROM employees
WHERE department_id >= 90
ORDER BY hiredata ASC;
/**按照员工的年薪的高低显示员工的信息和年薪**/
SELECT *， salary*12(1+IFNULL(commission_pct,0) 年薪
FROM employees
ORDER BY 年薪 ASC;
/**按照姓名的长度显示员工的姓名和工资**/
SELECT LENGTH(last_name) 姓名字节长度 ,last_name,salary
FROM employees
ORDER BY 姓名字节长度;
/**查询员工信息，先按工资升序排序，在按照员工编号降序排序**/
SELECT * FROM employees ORDER BY salary ASC，employee_id DESC;

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进阶练习：

/**选择工资不在8000-9000的员工的姓名和工资，按照工资的降序排序**/
SELECT last_name,salarty
FROM employees
WHERE salary NOT BETWEEN 8000 AND 9000
ORDER BY salary DESC；
/**查询邮箱中包含e的员工信息，先按照邮箱的字节数升序排序，在按照部门的降序排序**/
SELECT *
FROM employees
WHERE email LIKE('%e%')
ORDER BY LENGTH(email) ASC, department_id DESC
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