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Merge pull request #7 from FAyrolo/ejercicios_resueltos_y_scripts_de_BD
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@shirosweets
shirosweets authored Feb 2, 2025
2 parents 3dfeb9c + 2f15dd1 commit e158f4f
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86 changes: 86 additions & 0 deletions laboratorio/practicos/lab2.sql
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CREATE DATABASE world;
USE world;

CREATE TABLE country ( `Code` char(3) NOT NULL AUTO_INCREMENT DEFAULT '',
`CountryName` varchar(60) NOT NULL DEFAULT '',
`Continent` varchar(30) NOT NULL DEFAULT '',
`Region` varchar(60) NOT NULL DEFAULT '',
`SurfaceArea` numeric(20, 2) NOT NULL DEFAULT '0.00',
`IndepYear` smallint DEFAULT '0',
`Population` int NOT NULL DEFAULT '0',
`LifeExpectancy` smallint DEFAULT '0',
`GNP` numeric(40, 3) NOT NULL DEFAULT '0.000',
`GNPOld` numeric(40, 3) DEFAULT '0.000',
`LocalName` varchar(60) DEFAULT '',
`GovernmentForm` varchar(60) NOT NULL DEFAULT '',
`HeadOfState` varchar(60) DEFAULT '',
`Capital` int DEFAULT '0',
`Code2` char(2) NOT NULL DEFAULT '',
PRIMARY KEY (`Code`));


CREATE TABLE city (
`ID` int NOT NULL AUTO_INCREMENT,
`CityName` varchar(60) NOT NULL DEFAULT '',
`CountryCode` char(3) NOT NULL DEFAULT '',
`District` varchar(40) NOT NULL DEFAULT '',
`Population` int NOT NULL DEFAULT '0',
PRIMARY KEY (`ID`),
KEY `CountryCode` (`CountryCode`),
CONSTRAINT `fk_city_country` FOREIGN KEY (`CountryCode`) REFERENCES `country` (`Code`)
);


CREATE TABLE countrylanguage (
`CountryCode` char(3) NOT NULL DEFAULT '',
`Language` varchar(30) NOT NULL DEFAULT '',
`IsOfficial` enum('T', 'F') NOT NULL DEFAULT 'F',
`Percentage` numeric(5, 2) NOT NULL DEFAULT '0.0',
PRIMARY KEY (`CountryCode`, `Language`),
KEY `CountryCode` (`CountryCode`),
CONSTRAINT `fk_countrylanguage_country` FOREIGN KEY (`CountryCode`) REFERENCES `country` (`Code`)
);


CREATE TABLE continent (
`ContinentName` varchar(30) NOT NULL DEFAULT '',
`ContinentArea` int NOT NULL DEFAULT '0',
`LandmassPercent` numeric(4, 2) NOT NULL DEFAULT '0.0',
`MostPopulousCity` varchar(60) DEFAULT '',
PRIMARY KEY (`ContinentName`)
);

ALTER TABLE country ADD CONSTRAINT fk_country_continent FOREIGN KEY (Continent) REFERENCES continent(ContinentName);

INSERT INTO continent VALUES ('Africa', '30370000', '20.4', 'Cairo, Egypt');
INSERT INTO continent VALUES ('Antarctica', '14000000', '9.2', 'McMurdo Station');
INSERT INTO continent VALUES ('Asia', '44579000', '29.5', 'Mumbai, India');
INSERT INTO continent VALUES ('Europe', '10180000', '6.8', 'Instanbul, Turquia');
INSERT INTO continent VALUES ('North America', '24709000', '16.5', 'Ciudad de México, Mexico');
INSERT INTO continent VALUES ('Oceania', '8600000', '5.9', 'Sydney, Australia');
INSERT INTO continent VALUES ('South America', '17840000', '12.0', 'São Paulo, Brazil');


-- Parte 2
--1
SELECT CountryName, Region from country ORDER BY CountryName, Region;
--2
SELECT CityName, Population FROM city ORDER BY Population DESC LIMIT 10;
--3
SELECT CountryName, Region, SurfaceArea, GovernmentForm FROM country ORDER BY SurfaceArea ASC LIMIT 10;
--4
SELECT CountryName, GovernmentForm FROM country WHERE IndepYear IS NULL;
--5
SELECT Language, Percentage FROM countrylanguage WHERE IsOfficial = 'T';
--extra, 6
UPDATE countrylanguage SET Percentage = '100.0' WHERE CountryCode = 'AIA' AND Language = 'English';
UPDATE countrylanguage SET Percentage = '0.0' WHERE CountryCode = 'AIA' AND Language = 'English';
--7
SELECT * FROM city WHERE District LIKE '%rdoba' AND CountryCode = 'ARG'; -- No me toma la tilde la consola en MySQL
--8
DELETE FROM city WHERE District LIKE '%rdoba' AND CountryCode != 'ARG';
--9
SELECT CountryName, HeadOfState FROM country WHERE HeadOfState LIKE '%John %';
--10
SELECT CountryName, Population FROM country WHERE Population BETWEEN 35000000 AND 45000000;
--11
23 changes: 23 additions & 0 deletions laboratorio/practicos/lab2_p2.sql
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-- Parte 2
--1
SELECT CountryName, Region from country ORDER BY CountryName, Region;
--2
SELECT CityName, Population FROM city ORDER BY Population DESC LIMIT 10;
--3
SELECT CountryName, Region, SurfaceArea, GovernmentForm FROM country ORDER BY SurfaceArea ASC LIMIT 10;
--4
SELECT CountryName, GovernmentForm FROM country WHERE IndepYear IS NULL;
--5
SELECT Language, Percentage FROM countrylanguage WHERE IsOfficial = 'T';
--extra, 6
UPDATE countrylanguage SET Percentage = '100.0' WHERE CountryCode = 'AIA';
--7
SELECT * FROM city WHERE District LIKE '%rdoba' AND CountryCode = 'ARG'; -- No me toma la tilde la consola en MySQL
--8
DELETE FROM city WHERE District LIKE '%rdoba' AND CountryCode != 'ARG';
--9
SELECT CountryName, HeadOfState FROM country WHERE HeadOfState LIKE '%John %';
--10
SELECT CountryName, Population FROM country WHERE Population BETWEEN 35000000 AND 45000000;
--11
68 changes: 68 additions & 0 deletions laboratorio/practicos/lab3.sql
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--1
SELECT city.Name, c.Name, c.Region, c.GovernmentForm
FROM city INNER JOIN country AS c
ON city.CountryCode = c.Code
ORDER BY city.Population DESC LIMIT 10;
--2
SELECT co.Name, ci.Name, co.Capital, ci.ID
FROM country AS co LEFT JOIN city AS ci
ON co.Capital = ci.ID
ORDER BY co.Population ASC LIMIT 10;
--3
SELECT co.Name, co.Continent, lang.Language
FROM country AS co INNER JOIN countrylanguage AS lang
ON co.Code = lang.CountryCode
WHERE lang.IsOfficial = 'T';
--4
SELECT co.Name, ci.Name
FROM country AS co INNER JOIN city AS ci
ON co.Capital = ci.ID
ORDER BY co.SurfaceArea DESC LIMIT 20;
--5
SELECT city.Name, lang.Language, lang.Percentage
FROM city INNER JOIN countrylanguage AS lang
ON city.CountryCode = lang.CountryCode
WHERE lang.IsOfficial = 'T' LIMIT 20;
--6
(
SELECT Name, Population
FROM country
ORDER BY Population DESC LIMIT 10
)
UNION
(
SELECT Name, Population
FROM country
ORDER BY Population ASC LIMIT 10);
--7
(
SELECT c.Name
FROM country AS c INNER JOIN countrylanguage AS lang
ON c.Code = lang.CountryCode
WHERE lang.IsOfficial = 'T' AND lang.Language = 'English'
)
INTERSECT
(
SELECT c.Name
FROM country AS c INNER JOIN countrylanguage AS lang
ON c.Code = lang.CountryCode
WHERE lang.IsOfficial = 'T' AND lang.Language = 'French');
--8
(
SELECT c.Name
FROM country AS c INNER JOIN countrylanguage AS lang
ON c.Code = lang.CountryCode
WHERE lang.Language = 'English'
)
EXCEPT
(
SELECT c.Name
FROM country AS c INNER JOIN countrylanguage AS lang
ON c.Code = lang.CountryCode
WHERE lang.Language = 'Spanish');

--PArte 2
--1: Si, porque hacer un join por igualdad del codigo y despues quedarse solo las filas que son Argentina, es como hacer un join con una tabla donde ya te quedaste las filas que son Argentina
--Se podría decir que el WHERE actúa como un AND en términos de lógioa de selecciones en tablas
--2. No porque hacer el left join con las 2 condiciones (city.codigo=country.codigo y name=ARgentina) hace que generes la tabla que hacía originalmente el INNER JOIN, concatenada con la tabla en que tenés todos los nombres de ciudad asociados a un país NULL
-- con el WHERE name=Argentina después de joinear se descartan de la tabla las filas que tienen nombre de país NULL
127 changes: 127 additions & 0 deletions laboratorio/practicos/lab4.sql
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--1
SELECT city.Name, country.Name
FROM city, country
WHERE country.Name IN (
SELECT country.Name FROM country
WHERE country.Population < 10000
);

--2
SELECT city.name, city.Population
FROM city
WHERE city.Population > (
SELECT AVG(city.Population) FROM city
);

--3
--Minimo de poblacion de un pais asiatico
--SELECT MIN(asian_countries.Population) FROM (SELECT * FROM country WHERE country.Continent = 'Asia') AS asian_countries;
SELECT city.Name, city.Population FROM city
WHERE city.Population >= (
SELECT MIN(asian_countries.Population)
FROM (
SELECT * FROM country
WHERE country.Continent = 'Asia'
) AS asian_countries
);

--Este un extra, para poder corroborar que efectivamente las ciudades no son de un pais asiatico
SELECT ci.Name, co.Name, co.Continent, ci.Population, co.Code FROM (
SELECT city.Name, city.Population, city.CountryCode FROM city
WHERE city.Population >= (
SELECT MIN(asian_countries.Population)
FROM (
SELECT * FROM country
WHERE country.Continent = 'Asia'
) AS asian_countries
)
) AS ci INNER JOIN (
SELECT * FROM country
WHERE country.Continent != 'Asia'
) AS co
WHERE ci.CountryCode = co.Code;

--4
--sub_tabla = (SELECT * FROM countrylanguage WHERE countrylanguage.CountryCode = sp.CountryCode AND countrylanguage.IsOfficial = 'T') AS sub

SELECT co.Code, co.Name, cl.Language, cl.Percentage
FROM country AS co INNER JOIN countrylanguage AS cl
ON co.Code = cl.CountryCode
WHERE cl.Percentage >= (
SELECT MAX(sub.Percentage)
FROM (
SELECT * FROM countrylanguage
WHERE countrylanguage.CountryCode = cl.CountryCode AND countrylanguage.IsOfficial = 'T'
) AS sub
)
AND cl.IsOfficial = 'F';

--5
--ciudades = SELECT co.Region, co.SurfaceArea, ci.Population FROM country AS co INNER JOIN city AS ci ON co.Code = ci.CountryCode WHERE ci.Population > 100000
SELECT DISTINCT ciudades_100k.Region
FROM (
SELECT co.Region, co.Name, co.SurfaceArea, ci.Population
FROM country AS co INNER JOIN city AS ci
ON co.Code = ci.CountryCode
WHERE ci.Population > 100000
) AS ciudades_100k
WHERE ciudades_100k.SurfaceArea < 1000;

--SIN SUBQUERIES
SELECT DISTINCT co.Region, co.Name, co.SurfaceArea, ci.Population
FROM country AS co INNER JOIN city AS ci
ON co.Code = ci.CountryCode
WHERE co.SurfaceArea < 1000 AND ci.Population > 100000;

--6
SELECT co.Code, co.Name, SUM(ci.Population)
FROM country AS co INNER JOIN city AS ci
ON co.Code = ci.CountryCode
GROUP BY co.Code;

--7
--inner = SELECT AVG(coso.Percentage) FROM ( SELECT * FROM countrylanguage WHERE countrylanguage.IsOfficial = 'T') as coso;
SELECT co.Code, co.Name, cl.Language, cl.Percentage, cl.IsOfficial
FROM country AS co INNER JOIN countrylanguage AS cl
WHERE cl.Percentage >
(
SELECT AVG(sub.Percentage)
FROM (
SELECT * FROM countrylanguage
WHERE countrylanguage.IsOfficial = 'T'
) as sub
)
AND cl.IsOfficial = 'F';

--8
SELECT country.Continent, SUM(country.Population)
FROM country
GROUP BY country.Continent;

--9
SELECT exp.Continent, exp.LifeExpectancy
FROM (
SELECT country.Continent, AVG(country.LifeExpectancy) AS 'LifeExpectancy'
FROM country
GROUP BY country.Continent
) AS exp
WHERE exp.LifeExpectancy BETWEEN 40 AND 70;

--10
SELECT country.Continent, MIN(country.Population) AS Minima,
MAX(country.Population) AS Maxima,
AVG(country.Population) AS Promedio,
SUM(country.Population) AS Total
FROM country GROUP BY country.Continent;

--Si hubiese que hacerlo por ciudad de cada continente
SELECT co.Continent, MIN(ci.Population) AS Minima,
MAX(ci.Population) AS Maxima,
AVG(ci.Population) AS Promedio,
SUM(ci.Population) AS Total
FROM country AS co INNER JOIN city AS ci
ON co.Code = ci.CountryCode
GROUP BY co.Continent;

---PREGUNTA EXTRA:
-- La forma cochina es agregando la columna city.Name a la query, y desactivando el modo "only full group by" de SQL :)
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