#第三章 SELECT课后练习
# 1.查询员工12个月的工资总和，并起别名为ANNUAL SALARY
SELECT employee_id,last_name,salary * 12 "ANNUAL SALARY"
FROM employees;
#加奖金的情况
SELECT employee_id,last_name,salary * 12 *(1 + IFNULL(commission_pct,0)) "ANNUAL SALARY"
FROM employees;
# 2.查询employees表中去除重复的job_id以后的数据
SELECT DISTINCT job_id
FROM employees;
# 3.查询工资大于12000的员工姓名和工资
SELECT last_name,salary FROM employees
WHERE salary > 12000;

# 4.查询员工号为176的员工的姓名和部门号
SELECT last_name,department_id FROM employees
WHERE employee_id = 176;

# 5.显示表 departments 的结构，并查询其中的全部数据
DESC departments;

SELECT * FROM departments;