1 --显示员工的编号,姓名,工资,工资级别,所在部门的名称;(使用emp表) 2 SELECT * FROM emp; 3 SELECT * FROM salgrade; 4 SELECT * FROM dept; 5 SELECT e.empno, e.ename, e.sal, s.grade, d.dname 6 FROM emp e, salgrade s, dept d 7 WHERE e.sal BETWEEN s.losal AND s.hisal 8 AND e.deptno = d.deptno; 9 --现要求查询出每个雇员的姓名，工资，部门名称，工资在公司的等级（salgrade），及领导姓名及工资所在公司的等级 10 SELECT e1.empno, 11 e1.ename, 12 e1.sal, 13 s1.grade 员工工资等级, 14 d.dname, 15 e2.ename, 16 e2.sal 领导工资, 17 s2.grade 领导工资等级 18 FROM emp e1, salgrade s1, salgrade s2, dept d, emp e2 19 WHERE e1.sal BETWEEN s1.losal AND s1.hisal 20 AND e1.deptno = d.deptno 21 AND e1.mgr = e2.empno 22 AND e2.sal BETWEEN s2.losal AND s2.hisal 23 ORDER BY e1.sal; 24 --外联接 25 SELECT d.*, e.* FROM dept d, emp e WHERE d.deptno(+) = e.deptno; -- 右外联接(一) 26 SELECT d.*, e.* FROM dept d, emp e WHERE d.deptno = e.deptno(+); --左外联接（一） 27 SELECT d.*, e.* FROM dept d RIGHT JOIN emp e ON d.deptno = e.deptno; -- 右外联接（二） 28 SELECT d.*, e.* FROM dept d LEFT JOIN emp e ON d.deptno = e.deptno; -- 左外联接（二） 29 30 --查询员工编号，姓名，部门编号,部门名称（左外连接） 31 SELECT e.empno, e.ename, e.deptno, d.dname 32 FROM emp e 33 LEFT JOIN dept d 34 ON e.deptno = d.deptno; 35 SELECT e.empno, e.ename, e.deptno, d.dname 36 FROM emp e, dept d 37 WHERE e.deptno = d.deptno(+); 38 --查询员工编号，姓名，部门编号,部门名称（右外连接） 39 SELECT e.empno, e.ename, e.deptno, d.dname 40 FROM emp e 41 RIGHT JOIN dept d 42 ON e.deptno = d.deptno; 43 SELECT e.empno, e.ename, e.deptno, d.dname 44 FROM emp e, dept d 45 WHERE e.deptno(+) = d.deptno; 46 --查询30号部门的员工 47 SELECT * FROM emp; 48 SELECT * FROM emp e JOIN dept d USING (deptno) WHERE deptno = 30; 49 50 --查询员工编号，姓名，部门编号,部门名称，职务编号，职务名称并且薪资大于8000 按照薪资降序排列 51 SELECT e.employee_id, 52 e.last_name, 53 d.department_id, 54 d.department_name, 55 e.salary, 56 j.job_id, 57 j.job_title 58 FROM employees e 59 INNER JOIN departments d 60 ON e.department_id = d.department_id 61 INNER JOIN jobs j 62 ON e.job_id = j.job_id 63 WHERE e.salary > 8000 64 ORDER BY e.salary DESC; 65 COMMIT; 66 --查询所有部门的编号，部门名称，部门经理ID，部门经理姓名，部门所在的城市，国家，地区 67 SELECT * FROM departments; 68 SELECT * FROM locations; 69 SELECT * FROM employees; 70 SELECT * FROM countries; 71 SELECT d.department_id 部门编号, 72 d.department_name 部门名称, 73 d.manager_id 部门经理id, 74 e.last_name 部门经理姓名, 75 l.city 部门所在城市, 76 c.country_name 部门所在国家, 77 l.state_province 部门所在地区 78 FROM departments d 79 LEFT JOIN employees e 80 ON d.manager_id = e.manager_id 81 LEFT JOIN locations l 82 ON d.location_id = l.location_id 83 LEFT JOIN countries c 84 ON l.country_id = c.country_id 85 ORDER BY d.department_id; 86 --查询谁的工资比‘ABEL’ 87 select * from employees; 88 SELECT first_name || last_name NAME, salary 89 FROM employees 90 WHERE salary >= (SELECT salary FROM employees WHERE last_name = ‘Abel‘) 91 ORDER BY salary; 92 ----查询工资比7654高，同时与7788从事相同工作的全部雇员信息(emp) 93 SELECT * FROM emp; 94 SELECT * 95 FROM emp 96 WHERE sal > (SELECT sal FROM emp WHERE empno = 7654) 97 AND job = (SELECT job FROM emp WHERE empno = 7788); 98 --部门名称，部门员工数，部门平均工资，部门的最低收入雇员的姓名 99 SELECT d.dname, e.deptno, tmp.c, tmp.a, tmp.m, e.ename 100 FROM dept d, 101 emp e, 102 (SELECT e.deptno, COUNT(e.deptno) c, AVG(sal) a, MIN(sal) m 103 FROM emp e GROUP BY e.deptno) tmp 104 WHERE d.deptno = e.deptno 105 AND e.sal = tmp.m; 106 --求出每个部门的最低工资的雇员信息 107 SELECT * 108 FROM emp e, (SELECT MIN(sal) m FROM emp GROUP BY deptno) tmp 109 WHERE e.sal = tmp.m; 110 SELECT * 111 FROM emp e 112 WHERE e.sal in (SELECT MIN(sal) m FROM emp GROUP BY deptno); 113 ----查询工资与10部门中的任意一个人相等的员工信息 114 select * from emp; 115 SELECT * FROM emp WHERE sal in (SELECT sal FROM emp WHERE deptno = 10); 116 SELECT * FROM emp WHERE sal = ANY(SELECT sal FROM emp WHERE deptno = 10); 117 --查询所有是部门经理的员工(employees) 118 SELECT * FROM employees; 119 SELECT * 120 FROM employees 121 WHERE employee_id IN (SELECT manager_id FROM employees) ORDER BY employee_id; 122 SELECT * 123 FROM employees e1 124 WHERE EXISTS(SELECT manager_id FROM employees e2 WHERE e1.employee_id = e2.manager_id) ORDER BY employee_id; 125 ----查询所有不是部门经理的员工(employees) 126 SELECT * 127 FROM employees 128 WHERE employee_id <> ALL(SELECT manager_id FROM employees WHERE manager_id IS NOT NULL ) ORDER BY employee_id; 129 SELECT * 130 FROM employees 131 WHERE employee_id NOT IN (SELECT manager_id FROM employees WHERE manager_id IS NOT NULL) ORDER BY employee_id; 132 SELECT * 133 FROM employees e1 134 WHERE NOT EXISTS(SELECT manager_id FROM employees e2 WHERE e1.employee_id = e2.manager_id) ORDER BY employee_id; 135 --查询所有员工人数不少于3人的部门信息(employees) 136 SELECT * FROM departments; 137 SELECT * FROM employees; 138 SELECT d.*,tmp.c 139 FROM departments d INNER JOIN 140 (SELECT department_id,COUNT(employee_id) c FROM employees GROUP BY department_id) tmp 141 ON tmp.c >= 3 AND d.department_id = tmp.department_id; 142 ----查询姓名，职位，薪资在按照 职位，薪资 去重复之后存在的数据 143 SELECT ename,job,sal FROM emp WHERE exists(select distinct job,sal from emp); 144 --查询是本部门入职最早的但不是部门经理的员工 145 SELECT * FROM employees; 146 --1.查询本部门入职最早的员工 147 SELECT MIN(hire_date) FROM employees GROUP BY department_id; 148 --2.查询不是部门经理的员工 149 SELECT * 150 FROM employees e1 151 WHERE NOT EXISTS(SELECT manager_id FROM employees e2 WHERE e1.employee_id = e2.manager_id) ORDER BY employee_id; 152 --3.结合1、2给出本部门入职最早的但不是部门经理的员工 153 SELECT * 154 FROM employees e1 155 WHERE NOT EXISTS 156 (SELECT manager_id 157 FROM employees e2 158 WHERE e1.employee_id = e2.manager_id) 159 AND hire_date IN 160 (SELECT MIN(hire_date) FROM employees GROUP BY department_id) 161 ORDER BY employee_id; 162 --查询所有工资超过本部门平均工资的员工 163 --1. 查询各个部门的平均工资 164 SELECT department_id,AVG(salary) avgsa FROM employees GROUP BY department_id; 165 --2. 166 SELECT e.*, tmp.avgsa 167 FROM employees e, 168 (SELECT department_id, AVG(salary) avgsa 169 FROM employees 170 GROUP BY department_id) tmp 171 WHERE e.department_id = tmp.department_id 172 AND e.salary > tmp.avgsa; 173 174 --查询所有换过职务的员工 175 SELECT e.*,jh.* FROM employees e,job_history jh WHERE e.employee_id = jh.employee_id; 176 SELECT e.*, jh.* 177 FROM employees e 178 INNER JOIN job_history jh 179 ON e.employee_id = jh.employee_id;
时间： 2024-11-08 21:19:29