[推荐]ORACLE SQL:经典查询练手第五篇(不懂装懂,永世饭桶!)
本文与大家共同讨论与分享ORACLE SQL的一些常用经典查询,欢迎大家补充,同时你认为有那些经典的也可分享出来。在本文中,对每一个问题,你要是认为有什么更好的解决方法也欢迎你及时提出。交流与分享才能共同进步嘛,感谢!
接上四篇:
本篇数据查询属于复杂业务,难度比较高,请继续努力,通过我为大家设立的这个系列,循序渐进,只要你对每一篇,每一个试题都实践测试,认真练习。我相信你对常用、经典的、复杂的SQL已能熟能生巧,信手拈来!
本文使用ORACLE自带的人力资源(HR)实例数据,本文所用表结构如下:
ER图:
用SQL完成以下问题列表:
1. 哪些部门的人数比90 号部门的人数多。
2. Den(FIRST_NAME)、Raphaely(LAST_NAME)的领导是谁(非关联子查询)。
3. Den(FIRST_NAME)、Raphaely(LAST_NAME) 领导谁(非关联子查询)。
4. Den(FIRST_NAME)、Raphaely(LAST_NAME) 的领导是谁(关联子查询)。
5. Den(FIRST_NAME)、Raphaely(LAST_NAME) 领导谁(关联子查询)。
6. 列出在同一部门共事,入职日期晚但工资高于其他同事的员工:名字、工资、入职日期
(关联子查询)。
7. 哪些员工跟Den(FIRST_NAME)、Raphaely(LAST_NAME)不在同一个部门(非关联子查询)。
8. 哪些员工跟Den(FIRST_NAME)、Raphaely(LAST_NAME)不在同一个部门(关联子查询)。
9. Finance部门有哪些职位(非关联子查询)。
10. Finance部门有哪些职位(关联子查询)。
各试题解答如下(欢迎大家指出不同的方法或建议!):
/*--------1、哪些部门的人数比90号部门的人数多。---------*/
SQL> SELECT DEPARTMENT_ID,COUNT(*) FROM EMPLOYEES
GROUP BY DEPARTMENT_ID
HAVING COUNT(*) >
(SELECT COUNT(*) FROM EMPLOYEES
WHERE DEPARTMENT_ID = 90
);
DEPARTMENT_ID COUNT(*)
------------- ----------
6
45
5
34
6
/*-------2、Den(FIRST_NAME)、Raphaely(LAST_NAME)的
领导是谁(非关联子查询)。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES
WHERE EMPLOYEE_ID =
(SELECT MANAGER_ID FROM EMPLOYEES
WHERE FIRST_NAME = 'Den'
AND LAST_NAME = 'Raphaely'
);
FIRST_NAME||''||LAST_NAME
----------------------------------------------
Steven King
/*-------3、Den(FIRST_NAME)、Raphaely(LAST_NAME)领导谁(非关联子查询)。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES
WHERE MANAGER_ID IN
(SELECT EMPLOYEE_ID FROM EMPLOYEES
WHERE FIRST_NAME = 'Den'
AND LAST_NAME = 'Raphaely'
);
FIRST_NAME||''||LAST_NAME
----------------------------------------------
Alexander Khoo
Shelli Baida
Sigal Tobias
Guy Himuro
Karen Colmenares
--或者
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES
WHERE MANAGER_ID =
(SELECT EMPLOYEE_ID FROM EMPLOYEES
WHERE FIRST_NAME = 'Den'
AND LAST_NAME = 'Raphaely'
);
FIRST_NAME||''||LAST_NAME
----------------------------------------------
Alexander Khoo
Shelli Baida
Sigal Tobias
Guy Himuro
Karen Colmenares
/*-------4、Den(FIRST_NAME)、Raphaely(LAST_NAME)的领导是谁(关联子查询)。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES EMP1
WHERE EXISTS (
SELECT 1 FROM EMPLOYEES EMP2
WHERE FIRST_NAME = 'Den'
AND LAST_NAME = 'Raphaely'
AND EMP2.MANAGER_ID = EMP1.EMPLOYEE_ID);
FIRST_NAME||''||LAST_NAME
----------------------------------------------
Steven King
/*-------5、Den(FIRST_NAME)、Raphaely(LAST_NAME)领导谁(关联子查询)。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES EMP1
WHERE EXISTS (
SELECT 1 FROM EMPLOYEES EMP2
WHERE FIRST_NAME = 'Den'
AND LAST_NAME = 'Raphaely'
AND EMP2.EMPLOYEE_ID = EMP1.MANAGER_ID);
FIRST_NAME||''||LAST_NAME
----------------------------------------------
Alexander Khoo
Shelli Baida
Sigal Tobias
Guy Himuro
Karen Colmenares
/*-------6、列出在同一部门共事,入职日期晚但工资高于其他同事的员工:
名字、工资、入职日期(关联子查询)。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME AS 姓名,
SALARY AS 工资,HIRE_DATE AS 入职日期
FROM EMPLOYEES EMP1
WHERE EXISTS (
SELECT 1 FROM EMPLOYEES EMP2
WHERE EMP2.DEPARTMENT_ID = EMP1.DEPARTMENT_ID
AND EMP1.HIRE_DATE > EMP2.HIRE_DATE
AND EMP1.SALARY > EMP2.SALARY
);
姓名 工资 入职日期
---------------------------------------------- ---------- -----------
Nancy Greenberg 12000.00 1994-8-17
Jose Manuel Urman 7800.00 1998-3-7
Shelli Baida 2900.00 1997-12-24
Adam Fripp 8200.00 1997-4-10
Matthew Weiss 8000.00 1996-7-18
Jennifer Dilly 3600.00 1997-8-13
Julia Dellinger 3400.00 1998-6-24
Laura Bissot 3300.00 1997-8-20
Kevin Mourgos 5800.00 1999-11-16
Shanta Vollman 6500.00 1997-10-10
Vance Jones 2800.00 1999-3-17
Anthony Cabrio 3000.00 1999-2-7
Girard Geoni 2800.00 2000-2-3
Douglas Grant 2600.00 2000-1-13
Donald OConnell 2600.00 1999-6-21
Randall Perkins 2500.00 1999-12-19
Martha Sullivan 2500.00 1999-6-21
Kevin Feeney 3000.00 1998-5-23
Alana Walsh 3100.00 1998-4-24
Samuel McCain 3200.00 1998-7-1
Timothy Gates 2900.00 1998-7-11
Jean Fleaur 3100.00 1998-2-23
Winston Taylor 3200.00 1998-1-24
Michael Rogers 2900.00 1998-8-26
Britney Everett 3900.00 1997-3-3
Kelly Chung 3800.00 1997-6-14
Alexis Bull 4100.00 1997-2-20
Randall Matos 2600.00 1998-3-15
John Seo 2700.00 1998-2-12
Stephen Stiles 3200.00 1997-10-26
Mozhe Atkinson 2800.00 1997-10-30
Irene Mikkilineni 2700.00 1998-9-28
Julia Nayer 3200.00 1997-7-16
Hazel Philtanker 2200.00 2000-2-6
Ki Gee 2400.00 1999-12-12
Steven Markle 2200.00 2000-3-8
Sarah Bell 4000.00 1996-2-4
Nandita Sarchand 4200.00 1996-1-27
Lisa Ozer 11500.00 1997-3-11
Clara Vishney 10500.00 1997-11-11
Eleni Zlotkey 10500.00 2000-1-29
Gerald Cambrault 11000.00 1999-10-15
Alberto Errazuriz 12000.00 1997-3-10
Tayler Fox 9600.00 1998-1-24
Harrison Bloom 10000.00 1998-3-23
Danielle Greene 9500.00 1999-3-19
Charles Johnson 7211.00 2000-1-4
Mattea Marvins 7200.00 2000-1-24
Ellen Abel 11000.00 1996-5-11
Karen Partners 13500.00 1997-1-5
John Russell 14000.00 1996-10-1
Peter Tucker 10000.00 1997-1-30
David Bernstein 9500.00 1997-3-24
Jonathon Taylor 8600.00 1998-3-24
Alyssa Hutton 8800.00 1997-3-19
Peter Hall 9000.00 1997-8-20
Jack Livingston 8000.00 1998-4-23
Christopher Olsen 8000.00 1998-3-30
Elizabeth Bates 7300.00 1999-3-24
William Smith 7400.00 1999-2-23
Nanette Cambrault 7500.00 1998-12-9
rows selected
/*-------7、哪些员工跟Den(FIRST_NAME)、Raphaely(LAST_NAME)
不在同一个部门(非关联子查询)。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES
WHERE DEPARTMENT_ID <>
(SELECT DEPARTMENT_ID FROM EMPLOYEES
WHERE FIRST_NAME = 'Den'
AND LAST_NAME = 'Raphaely'
);
FIRST_NAME||''||LAST_NAME
----------------------------------------------
Steven King
Neena Kochhar
Lex De Haan
Alexander Hunold
Bruce Ernst
David Austin
Valli Pataballa
--等等
--或者
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES
WHERE DEPARTMENT_ID NOT IN
(SELECT DEPARTMENT_ID FROM EMPLOYEES
WHERE FIRST_NAME = 'Den'
AND LAST_NAME = 'Raphaely'
);
/*-------8、哪些员工跟Den(FIRST_NAME)、Raphaely(LAST_NAME)
不在同一个部门(关联子查询)。---------*/
SQL> SELECT FIRST_NAME || ' ' || LAST_NAME
FROM EMPLOYEES EMP1
WHERE NOT EXISTS (
SELECT 1 FROM EMPLOYEES EMP2
WHERE EMP1.DEPARTMENT_ID = EMP2.DEPARTMENT_ID
AND EMP2.FIRST_NAME = 'Den'
AND EMP2.LAST_NAME = 'Raphaely');
FIRST_NAME||''||LAST_NAME
----------------------------------------------
Kimberely Grant
Lex De Haan
Neena Kochhar
Steven King
Pat Fay
Michael Hartstein
Diana Lorentz
Valli Pataballa
--等等
/*-------9、Finance部门有哪些职位(非关联子查询)。---------*/
SQL> SELECT DISTINCT JOB_ID FROM EMPLOYEES
WHERE DEPARTMENT_ID = (
SELECT DEPARTMENT_ID FROM DEPARTMENTS
WHERE DEPARTMENT_NAME = 'Finance');
JOB_ID
----------
FI_ACCOUNT
FI_MGR
--或者
SQL> SELECT DISTINCT JOB_ID FROM EMPLOYEES
WHERE DEPARTMENT_ID IN (
SELECT DEPARTMENT_ID FROM DEPARTMENTS
WHERE DEPARTMENT_NAME = 'Finance');
JOB_ID
----------
FI_ACCOUNT
FI_MGR
/*-------10、Finance部门有哪些职位(关联子查询)。---------*/
SQL> SELECT DISTINCT JOB_ID FROM EMPLOYEES
WHERE EXISTS(
SELECT 1 FROM DEPARTMENTS
WHERE EMPLOYEES.DEPARTMENT_ID = DEPARTMENTS.DEPARTMENT_ID
AND DEPARTMENTS.DEPARTMENT_NAME = 'Finance');
JOB_ID
----------
FI_ACCOUNT
FI_MGR
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