第一篇
--------1．列出至少有一個員工的所有部門。---------
SQL> select dname from dept where deptno in(select deptno from emp);
SQL> select dname from dept where deptno in(select deptno from emp group by deptno having count(deptno) >=1);
--------2．列出薪金比“SMITH”多的所有員工。----------
SQL> select * from emp where sal > (select sal from emp where ename = 'SMITH');
--------3．列出所有員工的姓名及其直接上級的姓名。----------
SQL> select a.ename,(select ename from emp b where b.empno=a.mgr) as boss_name from emp a;
--------4．列出受雇日期早於其直接上級的所有員工。----------
SQL> select a.ename from emp a where a.hiredate<(select hiredate from emp b where b.empno=a.mgr);
--------5．列出部門名稱和這些部門的員工信息，同時列出那些沒有員工的部門----------
SQL> select a.dname,b.empno,b.ename,b.job,b.mgr,b.hiredate,b.sal,b.deptno
from dept a left join emp b on a.deptno=b.deptno;
--------6．列出所有“CLERK”（辦事員）的姓名及其部門名稱。----------
SQL> select a.ename,b.dname from emp a join dept b on a.deptno=b.deptno and a.job='CLERK';
--------7．列出最低薪金大於1500的各種工作。----------
SQL> select distinct job as HighSalJob from emp group by job having min(sal)>1500;
--------8．列出在部門“SALES”（銷售部）工作的員工的姓名，假定不知道銷售部的部門編號。----------
SQL> select ename from emp where deptno=(select deptno from dept where dname='SALES');
--------9．列出薪金高於公司平均薪金的所有員工。----------
SQL> select ename from emp where sal>(select avg(sal) from emp);
--------10．列出與“SCOTT”從事相同工作的所有員工。--------
SQL> select ename from emp where job=(select job from emp where ename='SCOTT');
--------11．列出薪金等於部門30中員工的薪金的所有員工的姓名和薪金。---------
SQL> select a.ename,a.sal from emp a where a.sal in (select b.sal
from emp b where b.deptno=30) and a.deptno$amp;<amp;$gt;30; <br="">--------12．列出薪金高於在部門30工作的所有員工的薪金的員工姓名和薪金。---------
SQL> select ename,sal from emp where sal>(select max(sal) from emp where deptno=30);
--------13．列出在每個部門工作的員工數量、平均工資和平均服務期限。---------
SQL> select (select b.dname from dept b where a.deptno=b.deptno) as deptname ,count(deptno) as deptcount,avg(sal) as deptavgsal
from emp a group by deptno;
--------14．列出所有員工的姓名、部門名稱和工資。---------
SQL> select a.ename,(select b.dname from dept b where b.deptno=a.deptno) as deptname,sal from emp a;
--------15．列出所有部門的詳細信息和部門人數。---------
SQL> select a.deptno,a.dname,a.loc,(select count(deptno) from emp b where b.deptno=a.deptno group by b.deptno) as deptcount from dept a;
--------16．列出各種工作的最低工資。---------
SQL> select job,avg(sal) from emp group by job;
--------17．列出各個部門的MANAGER（經理）的最低薪金。--------
SQL> select deptno,min(sal) from emp where job='MANAGER' group by deptno;
--------18．列出所有員工的年工資,按年薪從低到高排序。---------
SQL> select ename,(sal+nvl(comm,0))*12 as salpersal from emp order by salpersal;
第二篇
--------1. 找出EMP表中的姓名（ENAME）第三個字母是A 的員工姓名。---------
SQL> SELECT ENAME FROM SCOTT.EMP WHERE ENAME LIKE '__A%';
-------2. 找出EMP表員工名字中含有A 和N的員工姓名。----------
SQL> SELECT ENAME FROM SCOTT.EMP WHERE ENAME LIKE '%A%' AND ENAME LIKE '%N%';
--------3. 找出所有有佣金的員工，列出姓名、工資、佣金，顯示結果按工資從小到大，佣金從大到小。----------
SQL> SELECT ENAME,SAL + COMM AS WAGE,COMM
FROM SCOTT.EMP
ORDER BY WAGE,COMM DESC;
-------4. 列出部門編號為20的所有職位。----------
SQL> SELECT DISTINCT JOB FROM EMP WHERE DEPTNO = 20;
-------5. 列出不屬於SALES 的部門。----------
SQL> SELECT DISTINCT * FROM SCOTT.DEPT WHERE DNAME $amp;<amp;$gt; 'sales'; ="" <br="">或者
SQL> SELECT DISTINCT * FROM SCOTT.DEPT WHERE DNAME != 'SALES';
SQL> SELECT DISTINCT * FROM SCOTT.DEPT WHERE DNAME NOT IN('SALES');
SQL> SELECT DISTINCT * FROM SCOTT.DEPT WHERE DNAME NOT LIKE 'SALES';
---6. 顯示工資不在1000 到1500 之間的員工信息：名字、工資，按工資從大到小排序。---------
SQL> SELECT ENAME,SAL + COMM AS WAGE FROM SCOTT.EMP
WHERE SAL + COMM NOT BETWEEN 1000 AND 1500
ORDER BY WAGE DESC;
--或者
SQL> SELECT ENAME,SAL + COMM AS WAGE FROM SCOTT.EMP
2 WHERE SAL + COMM < 1000 OR SAL + COMM > 1500
3 ORDER BY WAGE DESC;
/*----- 7. 顯示職位為MANAGER 和SALESMAN，年薪在15000 和20000 之間的員工的信息：名字、職位、年薪。----------*/
SQL> SELECT ENAME 姓名,JOB 職位,(SAL + COMM) * 12 AS 年薪
2 FROM SCOTT.EMP
3 WHERE (SAL + COMM) * 12 BETWEEN 15000 AND 20000
4 AND JOB IN('MANAGER','SALESMAN');
/*----- 8. 說明以下兩條SQL語句的輸出結果：
SELECT EMPNO,COMM FROM EMP WHERE COMM IS NULL;
SELECT EMPNO,COMM FROM EMP WHERE COMM = NULL;
--說明：IS NULL是判斷某個字段是否為空，為空並不等價於為空字符串或為數字0；
--而 =NULL 是判斷某個值是否等於 NULL，NULL = NULL和NULL $amp;<amp;$gt; null都為="" false。<br="">
第三篇
/*--------1、改變NLS_LANG 的值，讓SELECT TO_CHAR(SALARY,'L99,999.99') FROM HR.EMPLOYEES WHERE ROWNUM < 5 輸出結果的貨幣單位是￥和$。---------*/
-----在沒有設置NLS_LANG的情況下：
SQL> SELECT TO_CHAR(SALARY,'L99,999.99')
FROM HR.EMPLOYEES
WHERE ROWNUM < 5;
/*--------2、列出前五位每個員工的名字，工資、漲薪后的的工資（漲幅為8%），以“元”為單位進行四舍五入。---------*/
SQL> SELECT FIRST_NAME,SALARY,ROUND(SALARY * 1.08) FROM HR.EMPLOYEES
WHERE ROWNUM <=5;
/*--------3、找出誰是最高領導，將名字按大寫形式顯示。---------*/
SQL> SELECT UPPER(FIRST_NAME || ' ' || LAST_NAME) AS NAME
FROM HR.EMPLOYEES
WHERE MANAGER_ID IS NULL;
/*--------4、找出David 的直接領導的名字。---------*/
SQL> SELECT UPPER(FIRST_NAME ||' ' || LAST_NAME) AS NAME
FROM HR.EMPLOYEES
WHERE EMPLOYEE_ID IN(
SELECT MANAGER_ID FROM HR.EMPLOYEES
WHERE FIRST_NAME = 'David' AND LAST_NAME = 'Austin');
/*--------5、First_Name 為Alexander，LAST_NAME為Hunold領導誰。（誰向David 報告）。---------*/
SQL> SELECT UPPER(FIRST_NAME ||' ' || LAST_NAME) AS NAME
FROM HR.EMPLOYEES
WHERE MANAGER_ID IN(
SELECT EMPLOYEE_ID FROM HR.EMPLOYEES
WHERE FIRST_NAME = 'Alexander' AND LAST_NAME = 'Hunold');
/*--------6、哪些員工的工資高於他直接上司的工資，列出員工的名字和工資，上司的名字和工資。---------*/
SQL> SELECT E.FIRST_NAME,E.SALARY,M.FIRST_NAME,M.SALARY
FROM EMPLOYEES E,EMPLOYEES M
WHERE E.MANAGER_ID = M.EMPLOYEE_ID AND E.SALARY > M.SALARY;
--要是只列出員工的名字與工資的話，還可以這樣：
SQL> SELECT E.FIRST_NAME,E.SALARY
FROM EMPLOYEES E WHERE E.SALARY $amp;>amp;$nbsp;
(SELECT M.SALARY FROM EMPLOYEES M
WHERE E.MANAGER_ID = M.EMPLOYEE_ID);
/*--------7、哪些員工和Chen(LAST_NAME)同部門。---------*/
SQL> SELECT FIRST_NAME FROM EMPLOYEES
WHERE DEPARTMENT_ID IN
(SELECT DEPARTMENT_ID FROM EMPLOYEES WHERE LAST_NAME = 'Chen')
AND LAST_NAME $amp;<amp;$gt; 'chen'; ="" <br=""> --或者--
SQL> SELECT E1.FIRST_NAME FROM EMPLOYEES E1,EMPLOYEES E2
WHERE E1.DEPARTMENT_ID = E2.DEPARTMENT_ID
AND E2.LAST_NAME = 'Chen' AND E1.LAST_NAME $amp;<amp;$gt; 'chen'; ="" <br=""> /*--------8、哪些員工跟De Haan(LAST_NAME)做一樣職位。---------*/
SQL> SELECT FIRST_NAME FROM EMPLOYEES
WHERE JOB_ID IN
(SELECT JOB_ID FROM EMPLOYEES
WHERE LAST_NAME = 'De Haan')
AND LAST_NAME $amp;<amp;$gt; 'de="" haan'; ="" <br=""> --或者--
SQL> SELECT E1.FIRST_NAME FROM EMPLOYEES E1,EMPLOYEES E2
WHERE E1.JOB_ID = E2.JOB_ID
AND E2.LAST_NAME = 'De Haan' AND E1.LAST_NAME $amp;<amp;$gt; 'de="" haan'; ="" <br=""> /*--------9、哪些員工跟Hall(LAST_NAME)不在同一個部門。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME FROM HR.EMPLOYEES
WHERE DEPARTMENT_ID NOT IN(
SELECT DEPARTMENT_ID FROM HR.EMPLOYEES
WHERE LAST_NAME = 'Hall');
--或者：
SQL> SELECT e1.FIRST_NAME FROM EMPLOYEES e1,EMPLOYEES e2
WHERE e1.DEPARTMENT_ID = e2.DEPARTMENT_ID(+)
and e2.LAST_NAME(+) = 'Hall'
and e2.LAST_NAME IS NULL;
/*-------10、哪些員工跟William（FIRST_NAME）、Smith(LAST_NAME)做不一樣的職位。--------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME FROM HR.EMPLOYEES
WHERE JOB_ID $amp;<amp;$gt; (select="" distinct="" job_id="" from="" employees ="" <br=""> WHERE FIRST_NAME = 'William' AND LAST_NAME = 'Smith');
/*--------11、顯示有提成的員工的信息：名字、提成、所在部門名稱、所在地區的名稱。---------*/
SQL> SELECT E.FIRST_NAME || ' ' || E.LAST_NAME AS NAME,
E.COMMISSION_PCT,D.DEPARTMENT_NAME,L.CITY
FROM HR.EMPLOYEES E,HR.DEPARTMENTS D,HR.LOCATIONS L
WHERE E.DEPARTMENT_ID = D.DEPARTMENT_ID
AND D.LOCATION_ID = L.LOCATION_ID
AND E.COMMISSION_PCT IS NOT NULL;
/*--------12、顯示Executive部門有哪些職位。---------*/
SQL> SELECT DISTINCT E.JOB_ID FROM HR.EMPLOYEES E,HR.DEPARTMENTS D
WHERE D.DEPARTMENT_ID = E.DEPARTMENT_ID
AND D.DEPARTMENT_NAME = 'Executive';
/*--------13、整個公司中，最高工資和最低工資相差多少。---------*/
SQL> SELECT MAX(SALARY) - MIN(SALARY) FROM HR.EMPLOYEES;
/*--------14、提成大於0 的人數。---------*/
SQL> SELECT COUNT(*) AS 提成大小0的人數 FROM HR.EMPLOYEES
WHERE COMMISSION_PCT > 0;
--或者
SQL> SELECT COUNT(COMMISSION_PCT) AS 提成大小0的人數
FROM HR.EMPLOYEES
WHERE COMMISSION_PCT > 0;
/*--------15、顯示整個公司的最高工資、最低工資、工資總和、平均工資保留到整數位。---------*/
SQL> SELECT MAX(NVL(SALARY,0)) AS 最高工資,
MIN(NVL(SALARY,0)) AS 最低工資,
SUM(NVL(SALARY,0)) AS 工資總和,
ROUND(AVG(NVL(SALARY,0))) AS 平均工資
FROM HR.EMPLOYEES;
/*--------16、整個公司有多少個領導。---------*/
SQL> SELECT COUNT(DISTINCT(MANAGER_ID)) FROM HR.EMPLOYEES
2 WHERE MANAGER_ID IS NOT NULL;
/*--------17、列出在同一部門入職日期晚但工資高於其他同事的員工：
名字、工資、入職日期。---------*/
SQL> SELECT DISTINCT E1.FIRST_NAME || ' ' || E1.LAST_NAME AS 姓名,
E1.SALARY AS 工資,E1.HIRE_DATE AS 入職日期
FROM HR.EMPLOYEES E1,HR.EMPLOYEES E2
WHERE E1.DEPARTMENT_ID = E2.DEPARTMENT_ID
AND E1.HIRE_DATE > E2.HIRE_DATE
AND E1.SALARY > E2.SALARY
ORDER BY 工資 DESC;
第四篇
/*--------1、各個部門平均、最大、最小工資、人數，按照部門號升序排列。---------*/
SQL> SELECT DEPARTMENT_ID AS 部門號,AVG(SALARY) AS 平均工資
,MAX(SALARY) AS 最高工資,MIN(SALARY) AS 最低工資
,COUNT(*) AS 人數
FROM EMPLOYEES
GROUP BY DEPARTMENT_ID
ORDER BY DEPARTMENT_ID ASC;
/*--------2、各個部門中工資大於5000的員工人數。---------*/
SQL> SELECT DEPARTMENT_ID,COUNT(*) FROM EMPLOYEES
WHERE SALARY > 5000
GROUP BY DEPARTMENT_ID;
/*--------3、各個部門平均工資和人數，按照部門名字升序排列。---------*/
SQL> SELECT DPTNAME,AVG(SALARY),COUNT(*) FROM
(SELECT
(SELECT DEPT.DEPARTMENT_NAME FROM DEPARTMENTS DEPT
WHERE DEPT.DEPARTMENT_ID = EMP.DEPARTMENT_ID) DPTNAME,
EMP.SALARY
FROM EMPLOYEES EMP)
GROUP BY DPTNAME
ORDER BY DPTNAME;
--或者--
SQL> SELECT DEPT.DEPARTMENT_NAME,AVG(EMP.SALARY),COUNT(*)
FROM EMPLOYEES EMP,DEPARTMENTS DEPT
WHERE EMP.DEPARTMENT_ID = DEPT.DEPARTMENT_ID
GROUP BY DEPT.DEPARTMENT_NAME
ORDER BY DEPT.DEPARTMENT_NAME;
/*--------4、列出每個部門中有同樣工資的員工的統計信息，
列出他們的部門號，工資，人數。---------*/
SQL> SELECT EMP1.DEPARTMENT_ID,EMP1.SALARY,COUNT(*) CNT
FROM EMPLOYEES EMP1,EMPLOYEES EMP2
WHERE EMP1.DEPARTMENT_ID = EMP2.DEPARTMENT_ID AND
EMP1.SALARY = EMP2.SALARY
AND EMP1.EMPLOYEE_ID $amp;<amp;$gt; emp2.employee_id ="" <br=""> GROUP BY EMP1.DEPARTMENT_ID,EMP1.SALARY;
/*--------5、列出同部門中工資高於1000 的員工數量超過2 人的部門，
顯示部門名字、地區名稱。---------*/
SQL> SELECT D.DEPARTMENT_NAME,L.CITY,COUNT(*)
FROM EMPLOYEES E,DEPARTMENTS D,LOCATIONS L
WHERE E.DEPARTMENT_ID = D.DEPARTMENT_ID AND
D.LOCATION_ID = L.LOCATION_ID AND
E.SALARY > 1000
GROUP BY D.DEPARTMENT_NAME,L.CITY
HAVING COUNT(*) > 2;
/*--------6、哪些員工的工資，高於整個公司的平均工資，
列出員工的名字和工資（降序）。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME,SALARY
FROM EMPLOYEES
WHERE SALARY > (
SELECT AVG(SALARY)
FROM EMPLOYEES
)
ORDER BY SALARY DESC;
/*--------7、哪些員工的工資，介於50號 和80號 部門平均工資之間。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME AS NAME,SALARY
FROM EMPLOYEES
WHERE SALARY
BETWEEN
(SELECT AVG(SALARY) FROM EMPLOYEES
WHERE DEPARTMENT_ID = 50)
AND (SELECT AVG(SALARY) FROM EMPLOYEES
WHERE DEPARTMENT_ID = 80);
/*--------8、所在部門平均工資高於5000 的員工名字。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME AS NAME,SALARY
FROM EMPLOYEES
WHERE DEPARTMENT_ID IN
(SELECT DEPARTMENT_ID FROM EMPLOYEES
GROUP BY DEPARTMENT_ID
HAVING AVG(SALARY) > 5000);
/*--------9、列出各個部門中工資最高的員工的信息：名字、部門號、工資。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME AS NAME
,SALARY,DEPARTMENT_ID
FROM EMPLOYEES
WHERE (DEPARTMENT_ID,SALARY) IN
(SELECT DEPARTMENT_ID,MAX(SALARY)
FROM EMPLOYEES
GROUP BY DEPARTMENT_ID);
/*--------10、最高的部門平均工資是多少。---------*/
SQL> SELECT MAX(AVGSALARY)
FROM(SELECT DEPARTMENT_ID,AVG(SALARY) AVGSALARY
FROM EMPLOYEES
GROUP BY DEPARTMENT_ID);