Finished

answers/exercise1.sql

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+CREATE DATABASE myNewDB;

answers/exercise10.sql

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+SELECT * FROM Students WHERE city IN ('Philadelphia', 'Trenton');

answers/exercise11.sql

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+SELECT * FROM Students ORDER BY city;

answers/exercise12.sql

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+SELECT * FROM Students ORDER BY city DESC;

answers/exercise13.sql

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+SELECT * FROM Students ORDER BY country, city;

answers/exercise14.sql

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+SELECT * FROM Students WHERE postal_code IS NULL;

answers/exercise15.sql

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+SELECT * FROM Students WHERE postal_code IS NOT NULL;

answers/exercise16.sql

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+UPDATE Students SET city = 'Edinburgh';

answers/exercise17.sql

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+UPDATE Students SET city = 'Edinburgh' WHERE country = 'Scotland';

answers/exercise18.sql

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+UPDATE Students SET (city = 'Edinburgh', country = 'Scotland') WHERE student_id = 35;

answers/exercise19.sql

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+DELETE FROM Students WHERE country = "Scotland";

answers/exercise2.sql

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+DROP DATABASE myNewDB;

answers/exercise20.sql

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+DELETE FROM Students;

answers/exercise3.sql

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+CREATE TABLE Users(
+    user_id     INT PRIMARY KEY,
+    last_name   VARCHAR(255),
+    first_name  VARCHAR(255),
+    address_     VARCHAR(255),
+    city        VARCHAR(255)
+);

answers/exercise4.sql

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+DROP TABLE Users;

answers/exercise5.sql

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+TRUNCATE TABLE myNewDb.Users;

answers/exercise6.sql

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+ALTER TABLE Users
+ADD Birthday DATE;

answers/exercise7.sql

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+ALTER TABLE Users
+DROP COLUMN birthday;

answers/exercise8.sql

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+CREATE TABLE Students(
+    student_id  INT PRIMARY KEY,
+    name_       VARCHAR(255),
+    address_    VARCHAR(255),
+    city        VARCHAR(255),
+    postal_code VARCHAR(255),
+    country     VARCHAR(255)
+);
+
+INSERT INTO Students
+VALUES('Jane Doe', '57 Union St', 'Glasgow', 'G13RB', 'Scotland');

answers/exercise9.sql

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+SELECT * FROM Students WHERE NOT city = 'Philadelphia';