Diferencia entre revisiones de «Usuario:ManuelRomero/ProgramacionWeb/INAEM2017/BasesDatos/SQL/ejercicios»
De WikiEducator
(→Ejercicios select/from/where con funciones) |
(→Actividades de funciones y agregados) |
||
(11 revisiones intermedias por el mismo usuario no mostrado) | |||
Línea 320: | Línea 320: | ||
===Ejercicios Sentencias Join=== | ===Ejercicios Sentencias Join=== | ||
− | + | [[Archivo:ej14.png]] | |
− | + | ||
− | [[Archivo: | + | |
<source lang=sql> | <source lang=sql> | ||
+ | SELECT e.last_name, m.last_name manager, m.salary, | ||
+ | j.grade_level | ||
+ | FROM employees e JOIN employees m | ||
+ | ON e.manager_id = m.employee_id | ||
+ | JOIN job_grades j | ||
+ | ON m.salary BETWEEN j.lowest_sal AND j.highest_sal | ||
+ | AND m.salary > 15000; | ||
</source> | </source> | ||
+ | <hr /> | ||
+ | |||
+ | ===Ejercicios Sentencias Group by=== | ||
+ | ====Actividades de funciones y agregados==== | ||
<hr /> | <hr /> | ||
[[Archivo:ej_func_01.png]] | [[Archivo:ej_func_01.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
+ | [[Archivo:sol_groupby1.png]] | ||
+ | }} | ||
− | |||
<hr /> | <hr /> | ||
[[Archivo:ej_func_02.png]] | [[Archivo:ej_func_02.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
− | + | [[Archivo:sol_group_by2.png]] | |
+ | }} | ||
<hr /> | <hr /> | ||
[[Archivo:ej_func_03.png]] | [[Archivo:ej_func_03.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
− | + | [[Archivo:sol_group_by5.png]] | |
+ | }} | ||
<hr /> | <hr /> | ||
[[Archivo:ej_func_04.png]] | [[Archivo:ej_func_04.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
− | + | [[Archivo:sol_group_by5b.png]] | |
+ | [[Archivo:sol_group_by5c.png]] | ||
+ | }} | ||
<hr /> | <hr /> | ||
[[Archivo:ej_func_05.png]] | [[Archivo:ej_func_05.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
− | + | [[Archivo:sol_group_by6.png]] | |
+ | }} | ||
<hr /> | <hr /> | ||
[[Archivo:ej_func_06.png]] | [[Archivo:ej_func_06.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
− | + | [[Archivo:sol_group_by7.png]] | |
+ | }} | ||
<hr /> | <hr /> | ||
[[Archivo:ej_func_07.png]] | [[Archivo:ej_func_07.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
− | + | [[Archivo:sol_group_by8.png]] | |
+ | }} | ||
+ | |||
<hr /> | <hr /> | ||
[[Archivo:ej_func_08.png]] | [[Archivo:ej_func_08.png]] | ||
− | + | {{Plegable|hide|Solucion| | |
− | + | [[Archivo:sol_group_by9.png]] | |
+ | }} | ||
<hr /> | <hr /> | ||
[[Archivo:ej_func_09.png]] | [[Archivo:ej_func_09.png]] | ||
− | |||
− | |||
<hr /> | <hr /> | ||
[[Archivo:ej_func_10.png]] | [[Archivo:ej_func_10.png]] | ||
− | |||
− | |||
<hr /> | <hr /> | ||
[[Archivo:ej_func_11.png]] | [[Archivo:ej_func_11.png]] | ||
− | |||
− | |||
<hr /> | <hr /> | ||
Línea 416: | Línea 429: | ||
</source> | </source> | ||
<hr /> | <hr /> | ||
+ | |||
====Ejercicios de agrupación ==== | ====Ejercicios de agrupación ==== | ||
<br /> | <br /> | ||
Línea 510: | Línea 524: | ||
<hr /> | <hr /> | ||
}} | }} | ||
− | |||
===Ejercicios Sentencias de subconsultas=== | ===Ejercicios Sentencias de subconsultas=== | ||
+ | ====Ejercicios con subconsultas ==== | ||
+ | <br /> | ||
+ | [[Archivo:prac_subquery_1.png|600px]] | ||
+ | <br /> | ||
+ | [[Archivo:prac_subquery_1s.png|600px]] | ||
+ | <hr /> | ||
+ | [[Archivo:prac_subquery_2.png|600px]] | ||
+ | <br /> | ||
+ | [[Archivo:prac_subquery_2s.png|600px]] | ||
+ | <hr /> | ||
+ | [[Archivo:prac_subquery_3.png|600px]] | ||
+ | <br /> | ||
+ | [[Archivo:prac_subquery_3s.png|600px]] | ||
+ | <hr /> | ||
+ | [[Archivo:prac_subquery_4.png|600px]] | ||
+ | <br /> | ||
+ | [[Archivo:prac_subquery_4s.png|600px]] | ||
+ | <hr /> | ||
+ | [[Archivo:prac_subquery_5.png|600px]] | ||
+ | <br /> | ||
+ | <!--[[Archivo:prac_subquery_5s.png|600px]]--> | ||
+ | <hr /> | ||
+ | [[Archivo:prac_subquery_6.png|600px]] | ||
+ | <br /> | ||
+ | <!--[[Archivo:prac_subquery_6s.png|600px]]--> | ||
+ | <hr /> | ||
+ | [[Archivo:prac_subquery_7.png|600px]] | ||
+ | <br /> | ||
+ | <!--[[Archivo:prac_subquery_7s.png|600px]]--> | ||
+ | <hr /> | ||
+ | {{MRM_Actividad|Title=Ejercicios de subconsultas | ||
+ | [[Archivo:ej16.png]] | ||
+ | <source lang=sql> | ||
+ | SELECT department_id, MIN(salary) | ||
+ | FROM employees | ||
+ | GROUP BY department_id | ||
+ | HAVING AVG(salary) = (SELECT MAX(AVG(salary)) | ||
+ | FROM employees | ||
+ | GROUP BY department_id); | ||
+ | </source> | ||
+ | <hr /> | ||
+ | [[Archivo:ej17.png]] | ||
+ | <source lang=sql> | ||
+ | SELECT * | ||
+ | FROM | ||
+ | departments | ||
+ | WHERE department_id NOT IN(SELECT department_id | ||
+ | FROM employees | ||
+ | WHERE job_id = 'SA_REP' | ||
+ | AND department_id IS NOT NULL); | ||
+ | |||
+ | </source> | ||
+ | <hr /> | ||
+ | [[Archivo:ej20.png]] | ||
+ | <source lang=sql> | ||
+ | SELECT last_name, TO_CHAR(hire_date, 'DAY') day | ||
+ | FROM employees | ||
+ | WHERE TO_CHAR(hire_date, 'Day') = (SELECT TO_CHAR(hire_date, 'Day') | ||
+ | FROM employees | ||
+ | GROUP BY TO_CHAR(hire_date, 'Day') | ||
+ | HAVING COUNT(*) = (SELECT MAX(COUNT(*)) | ||
+ | FROM employees | ||
+ | GROUP BY TO_CHAR(hire_date,'Day'))); | ||
+ | |||
+ | </source> | ||
+ | <hr /> | ||
+ | }} |
Última revisión de 00:45 22 may 2018
Contenido
Ejercicios de bases de datos relacionales
- Ejecuta los siguientes ficheros tanto en mysql como en oracle
Create.sql |
---|
CREATE TABLE REGIONS( REGION_ID NUMERIC, REGION_NAME VARCHAR(25), PRIMARY KEY (REGION_ID)); CREATE TABLE COUNTRIES( COUNTRY_ID CHAR(2), COUNTRY_NAME VARCHAR(40), REGION_ID NUMERIC, PRIMARY KEY (COUNTRY_ID), FOREIGN KEY(REGION_ID) REFERENCES REGIONS(REGION_ID)); CREATE TABLE LOCATIONS ( LOCATION_ID NUMERIC(4), STREET_ADDRESS VARCHAR(40), POSTAL_CODE VARCHAR(12), CITY VARCHAR(30) NOT NULL, STATE_PROVINCE VARCHAR(25), COUNTRY_ID CHAR(2), PRIMARY KEY(LOCATION_ID), FOREIGN KEY(COUNTRY_ID) REFERENCES COUNTRIES(COUNTRY_ID)); CREATE TABLE DEPARTMENTS( DEPARTMENT_ID NUMERIC(4), DEPARTMENT_NAME VARCHAR(30) NOT NULL, MANAGER_ID NUMERIC(6), LOCATION_ID NUMERIC(4), PRIMARY KEY(DEPARTMENT_ID), FOREIGN KEY(LOCATION_ID) REFERENCES LOCATIONS(LOCATION_ID)); CREATE TABLE JOBS( JOB_ID VARCHAR(10), JOB_TITLE VARCHAR(35) NOT NULL, MIN_SALARY NUMERIC(6), MAX_SALARY NUMERIC(6), PRIMARY KEY(JOB_ID)); CREATE TABLE EMPLOYEES( EMPLOYEE_ID NUMERIC(6), FIRST_NAME VARCHAR(20), LAST_NAME VARCHAR(25) NOT NULL, EMAIL VARCHAR(25) NOT NULL, PHONE_numeric VARCHAR(20), HIRE_DATE DATE NOT NULL, JOB_ID VARCHAR(10) NOT NULL, SALARY NUMERIC(8,2), COMMISSION_PCT NUMERIC(2,2), MANAGER_ID NUMERIC(6), DEPARTMENT_ID NUMERIC(4), PRIMARY KEY(EMPLOYEE_ID), FOREIGN KEY(JOB_ID) REFERENCES JOBS(JOB_ID), FOREIGN KEY(DEPARTMENT_ID) REFERENCES DEPARTMENTS(DEPARTMENT_ID), CONSTRAINT EMP_EMAIL_UK UNIQUE(EMAIL)); CREATE TABLE JOB_HISTORY( EMPLOYEE_ID NUMERIC(6), START_DATE DATE NOT NULL, END_DATE DATE NOT NULL, JOB_ID VARCHAR(10) NOT NULL, DEPARTMENT_ID NUMERIC(4), PRIMARY KEY(EMPLOYEE_ID, JOB_ID), FOREIGN KEY(EMPLOYEE_ID) REFERENCES EMPLOYEES(EMPLOYEE_ID), FOREIGN KEY(JOB_ID) REFERENCES JOBS(JOB_ID), FOREIGN KEY(DEPARTMENT_ID) REFERENCES DEPARTMENTS(DEPARTMENT_ID)); CREATE TABLE JOB_GRADES( GRADE_LEVEL VARCHAR(3), LOWEST_SAL NUMERIC, HIGHEST_SAL NUMERIC); |
- Fichero SQL de inserción
Insert.sql |
---|
INSERT INTO REGIONS VALUES (1, 'Europe'); INSERT INTO REGIONS VALUES (2, 'Americas'); INSERT INTO REGIONS VALUES (3, 'Asia'); INSERT INTO REGIONS VALUES (4, 'Middle East and Africa'); INSERT INTO COUNTRIES VALUES( 'CA', 'Canada', 2); INSERT INTO COUNTRIES VALUES( 'DE', 'Germany', 1); INSERT INTO COUNTRIES VALUES( 'UK', 'United Kingdom', 1); INSERT INTO COUNTRIES VALUES( 'US', 'United States of America', 2); INSERT INTO LOCATIONS VALUES( 1400, '2014 Jabberwocky Rd', '26192', 'Southlake', 'Texas', 'US'); INSERT INTO LOCATIONS VALUES( 1500, '2001 Interiors Blvd', '99236', 'South San Francisco', 'California', 'US'); INSERT INTO LOCATIONS VALUES( 1700, '2004 Charade Rd', '98199', 'Seattle', 'Washington', 'US'); INSERT INTO LOCATIONS VALUES( 1800, '460 Bloor St. W.', 'ON M5S 1X8', 'Toronto', 'Ontario', 'CA'); INSERT INTO LOCATIONS VALUES( 2500, 'Magdalen Centre, The Ofxord Science Park', 'OX9 9ZB', 'Oxford', 'Oxford', 'UK'); INSERT INTO DEPARTMENTS VALUES (10, 'Administration', 200, 1700); INSERT INTO DEPARTMENTS VALUES (20, 'Marketing', 201, 1800); INSERT INTO DEPARTMENTS VALUES (50, 'Shipping', 124, 1500); INSERT INTO DEPARTMENTS VALUES (60, 'IT', 103, 1400); INSERT INTO DEPARTMENTS VALUES (80, 'Sales', 149, 2500); INSERT INTO DEPARTMENTS VALUES (90, 'Executive', 100, 1700); INSERT INTO DEPARTMENTS VALUES (110, 'Accounting', 205, 1700); INSERT INTO DEPARTMENTS VALUES (190, 'Contracting', NULL, 1700); INSERT INTO JOBS VALUES('AD_PRES', 'President', 20000, 40000); INSERT INTO JOBS VALUES('AD_VP', 'Administration Vice President', 15000, 30000); INSERT INTO JOBS VALUES('AD_ASST', 'Administration Assistant', 3000, 6000); INSERT INTO JOBS VALUES('AC_MGR', 'Accounting Manager', 8200, 16000); INSERT INTO JOBS VALUES('AC_ACCOUNT', 'Public Accountant', 4200, 9000); INSERT INTO JOBS VALUES('SA_MAN', 'Sales Manager', 10000, 20000); INSERT INTO JOBS VALUES('SA_REP', 'Sales Representative', 6000, 12000); INSERT INTO JOBS VALUES('ST_MAN', 'Stock Manager', 5500, 8500); INSERT INTO JOBS VALUES('ST_CLERK', 'Stock Clerk', 2000, 5000); INSERT INTO JOBS VALUES('IT_PROG', 'Programmer', 4000, 10000); INSERT INTO JOBS VALUES('MK_MAN', 'Marketing Manager', 9000, 15000); INSERT INTO JOBS VALUES('MK_REP', 'Marketing Representative', 4000, 9000); INSERT INTO EMPLOYEES VALUES (100, 'Steven', 'King', 'SKING', '515.123.4567', DATE '1987-06-17','AD_PRES', 24000, NULL, NULL, 90); INSERT INTO EMPLOYEES VALUES (101, 'Neena', 'Kochhar', 'NKOCHHAR', '515.123.4568', DATE '1989-09-21','AD_VP', 17000, NULL, 100, 90); INSERT INTO EMPLOYEES VALUES (102, 'Lex', 'De Haan', 'LDEHAAN', '515.123.4569', DATE '1993-01-13','AD_VP', 17000, NULL, 100, 90); INSERT INTO EMPLOYEES VALUES (103, 'Alexander', 'Hunold', 'AHUNOLD', '590.423.4567', DATE '1990-01-03','IT_PROG', 9000, NULL, 102, 60); INSERT INTO EMPLOYEES VALUES (104, 'Bruce', 'Ernst', 'BERNST', '590.423.4568', DATE '1991-05-21','IT_PROG', 6000, NULL, 103, 60); INSERT INTO EMPLOYEES VALUES (107, 'Diana', 'Lorentz', 'DLORENTZ', '590.423.5567', DATE '1999-02-07','IT_PROG', 4200, NULL, 103, 60); INSERT INTO EMPLOYEES VALUES (124, 'Kevin', 'Mourgos', 'KMOURGOS', '650.123.5234', DATE '1999-11-16','ST_MAN', 5800, NULL, 100, 50); INSERT INTO EMPLOYEES VALUES (141, 'Trenna', 'Rajs', 'TRAJS', '650.121.8009', DATE '1995-10-15','ST_CLERK', 3500, NULL, 124, 50); INSERT INTO EMPLOYEES VALUES (142, 'Curtis', 'Davies', 'CDAVIES', '650.121.2994', DATE '1997-01-29','ST_CLERK', 3100, NULL, 124, 50); INSERT INTO EMPLOYEES VALUES (143, 'Randall', 'Matos', 'RMATOS', '650.121.2874', DATE '1998-03-15','ST_CLERK', 2600, NULL, 124, 50); INSERT INTO EMPLOYEES VALUES (144, 'Peter', 'Vargas', 'PVARGAS', '650.121.2004', DATE '1998-07-09','ST_CLERK', 2500, NULL, 124, 50); INSERT INTO EMPLOYEES VALUES (149, 'Eleni', 'Zlotkey', 'EZLOTKEY', '011.44.1344.429018', DATE '2000-01-29','SA_MAN', 10500, .2, 100, 80); INSERT INTO EMPLOYEES VALUES (174, 'Ellen', 'Abel', 'EABEL', '011.44.1644.429267', DATE '1996-05-11','SA_REP', 11000, .3, 149, 80); INSERT INTO EMPLOYEES VALUES (176, 'Jonathan', 'Taylor', 'JTAYLOR', '011.44.1644.429265', DATE '1998-03-24','SA_REP', 8600, .2, 149, 80); INSERT INTO EMPLOYEES VALUES (178, 'Kimberely', 'Grant', 'KGRANT', '011.44.1644.429263', DATE '1999-05-24','SA_REP', 7000, .15, 149, NULL); INSERT INTO EMPLOYEES VALUES (200, 'Jennifer', 'Whalen', 'JWHALEN', '515.123.4444', DATE '1987-09-17','AD_ASST', 4400, NULL, 101, 10); INSERT INTO EMPLOYEES VALUES (201, 'Michael', 'Hartstein', 'MHARTSTE', '515.123.5555', DATE '1996-02-17','MK_MAN', 13000, NULL, 100, 20); INSERT INTO EMPLOYEES VALUES (202, 'Pat', 'Fay', 'PFAY', '603.123.6666', DATE '1997-08-17','MK_REP', 6000, NULL, 201, 20); INSERT INTO EMPLOYEES VALUES (205, 'Shelley', 'Higgins', 'SHIGGINS', '515.123.8080', DATE '1994-06-07','AC_MGR', 12000, NULL, 101, 110); INSERT INTO EMPLOYEES VALUES (206, 'William', 'Gietz', 'WGIETZ', '515.123.8181', DATE '1994-06-07','AC_ACCOUNT', 8300, NULL, 205, 110); INSERT INTO JOB_HISTORY VALUES( 102,DATE '1993-01-13',DATE '1998-07-24', 'IT_PROG', 60); INSERT INTO JOB_HISTORY VALUES( 101,DATE '1989-09-21',DATE '1993-10-27', 'AC_ACCOUNT', 110); INSERT INTO JOB_HISTORY VALUES( 101,DATE '1993-10-28',DATE '1997-03-15', 'AC_MGR', 110); INSERT INTO JOB_HISTORY VALUES( 201,DATE '1996-06-02', DATE '1999-12-19', 'MK_REP', 20); INSERT INTO JOB_HISTORY VALUES( 144,DATE '1998-03-24',DATE '1999-12-31', 'ST_CLERK', 50); INSERT INTO JOB_HISTORY VALUES( 142,DATE '1997-01-29',DATE '1999-12-31', 'ST_CLERK', 50); INSERT INTO JOB_HISTORY VALUES( 200,DATE '1987-09-17',DATE '1993-06-17', 'AD_ASST', 90); INSERT INTO JOB_HISTORY VALUES( 176,DATE '1998-03-24',DATE '1998-12-31', 'SA_REP', 80); INSERT INTO JOB_HISTORY VALUES( 176,DATE '1999-01-01', DATE '1999-12-31', 'SA_MAN', 80); INSERT INTO JOB_HISTORY VALUES( 200,DATE '1994-07-01',DATE '1998-12-31', 'AC_ACCOUNT', 90); INSERT INTO JOB_GRADES VALUES('A', 1000, 2999); INSERT INTO JOB_GRADES VALUES('B', 3000, 5999); INSERT INTO JOB_GRADES VALUES('C', 6000, 9999); INSERT INTO JOB_GRADES VALUES('D', 10000, 14999); INSERT INTO JOB_GRADES VALUES('E', 15000, 24999); INSERT INTO JOB_GRADES VALUES('F', 25000, 40000); |
drop.sql |
---|
DROP TABLE JOB_GRADES; DROP TABLE JOB_HISTORY; DROP TABLE EMPLOYEES; DROP TABLE JOBS; DROP TABLE DEPARTMENTS; DROP TABLE LOCATIONS; DROP TABLE COUNTRIES; DROP TABLE REGIONS; |
Ejercicios Sentencias DCL
Ejercicios Sentencias Select
Ejercicios select/from/where con funciones
Secretari@ es el tipo ST_CLERK mysql> SELECT * FROM EMPLOYEES WHERE JOB_ID ="ST_CLERK" AND HIRE_DATE>"1997-12-31"; SELECT LAST_NAME, JOB_ID,SALARY, COMMISSION_PCT FROM EMPLOYEES WHERE COMMISSION_PCT IS NOT NULL ORDER BY LAST_NAME DESC; SELECT 'El salario de '||Last_name|| 'va a ser con un incremento del 10% de '|| round(Salary *1.10) || ' dólares' AS "Nuevo Salario" FROM EMPLOYEES WHERE COMMISSION_pCT IS NULL SELECT last_name, trunc(months_between(sysdate, hire_date)/12) AS "años", trunc(MOD(months_between(sysdate, hire_date),12))AS "meses" FROM employees ORDER BY hire_date; SELECT * FROM empleados WHERE substr(last_name,1,1) IN ('J', 'K', 'L', 'M') SELECT last_name, salary, decode (commission_pct,NULL, 'No' , 'Yes') AS "comisión" FROM employees SELECT department_name, location_id,job_id, salary FROM departments d, employees e WHERE d.department_id = e.department_id AND location_id = '&localizacion'; SELECT COUNT(*) FROM employees WHERE last_name LIKE '%n'; --or SELECT COUNT(*) FROM employees WHERE SUBSTR(last_name, -1) = 'n'; SELECT DISTINCT job_id FROM employees WHERE department_id IN (10, 20); SELECT last_name, hire_date FROM employees WHERE TO_CHAR(hire_date, 'DD') < 16; SELECT last_name, salary, TRUNC(salary, -3)/1000 FROM employees; SELECT last_name, TO_CHAR(hire_date, 'Month DD') BIRTHDAY FROM employees ORDER BY TO_CHAR(hire_date, 'DDD');
|
Ejercicios Sentencias Join
SELECT e.last_name, m.last_name manager, m.salary, j.grade_level FROM employees e JOIN employees m ON e.manager_id = m.employee_id JOIN job_grades j ON m.salary BETWEEN j.lowest_sal AND j.highest_sal AND m.salary > 15000;
Ejercicios Sentencias Group by
Actividades de funciones y agregados
Solucion |
---|
Solucion |
---|
Solucion |
---|
Solucion |
---|
Solucion |
---|
Solucion |
---|
Solucion |
---|
Solucion |
---|
Ejercicios de agrupación
SELECT d.department_id, d.department_name, d.location_id, COUNT(e.employee_id) FROM employees e RIGHT OUTER JOIN departments d ON e.department_id = d.department_id GROUP BY d.department_id, d.department_name, d.location_id; SELECT e.job_id, COUNT(e.job_id) FREQUENCY FROM employees e JOIN departments d ON e.department_id = d.department_id WHERE d.department_name IN ('Administration', 'Executive') GROUP BY e.job_id ORDER BY FREQUENCY DESC; SELECT d.department_id, d.department_name, COUNT(e1.employee_id) employees, NVL(TO_CHAR(AVG(e1.salary), '99999.99'), 'No average') avg_sal, e2.last_name, e2.salary, e2.job_id FROM departments d RIGHT OUTER JOIN employees e1 ON d.department_id = e1.department_id RIGHT OUTER JOIN employees e2 ON d.department_id = e2.department_id GROUP BY d.department_id, d.department_name, e2.last_name, e2.salary, e2.job_id ORDER BY d.department_id, employees;
SELECT d.department_id, d.department_name, COUNT(*) FROM departments d JOIN employees e ON d.department_id = e.department_id GROUP BY d.department_id, d.department_name HAVING COUNT(*) < 3;
SELECT d.department_id, d.department_name, COUNT(*) FROM departments d JOIN employees e ON d.department_id = e.department_id GROUP BY d.department_id, d.department_name HAVING COUNT(*) = (SELECT MAX(COUNT(*)) FROM employees GROUP BY department_id);
SELECT d.department_id, d.department_name, COUNT(*) FROM departments d JOIN employees e ON d.department_id = e.department_id GROUP BY d.department_id, d.department_name HAVING COUNT(*) = (SELECT MIN(COUNT(*)) FROM employees GROUP BY department_id); SELECT e.employee_id, e.last_name, e.department_id, e.salary, AVG(s.salary) FROM employees e JOIN employees s ON e.department_id = s.department_id GROUP BY e.employee_id, e.last_name, e.department_id, e.salary;
|
Ejercicios Sentencias de subconsultas
Ejercicios con subconsultas
{{{1}}}
|