followed all instructions

answers/exercise1.sql

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+CREATE DATABASE myNewDB;

answers/exercise10.sql

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+SELECT *
+FROM Students
+WHERE City LIKE 'Philadelphia' OR 'Trenton';

answers/exercise11.sql

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+SELECT *
+FROM Students
+ORDER BY City ASC;

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 ASC;

answers/exercise14.sql

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+SELECT *
+FROM Students
+WHERE PostalCode IS NULL;

answers/exercise15.sql

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+SELECT *
+FROM Students
+WHERE PostalCode 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 City LIKE 'Scotland';

answers/exercise18.sql

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+UPDATE Students
+SET City = 'Edinburgh',
+	Country = 'Scotland'
+WHERE id = 35;

answers/exercise19.sql

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+DELETE FROM Students
+WHERE Country LIKE '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 (
+	UserID INT,
+    LastName VARCHAR(255),
+    FirstName 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 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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+INSERT INTO Students (StudentName, Address, City, PostalCode, Country)
+	VALUES ('Jane Doe', '57 Union St', 'Glasgow, Scotland', 'G13RB');

answers/exercise9.sql

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+SELECT *
+FROM Students
+WHERE City NOT LIKE 'Philadelphia';