diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..2c5d264
Binary files /dev/null and b/.DS_Store differ
diff --git a/answers/exercise1.sql b/answers/exercise1.sql
index e69de29..07c2318 100644
--- a/answers/exercise1.sql
+++ b/answers/exercise1.sql
@@ -0,0 +1 @@
+CREATE DATABASE myNewDB;
\ No newline at end of file
diff --git a/answers/exercise10.sql b/answers/exercise10.sql
index e69de29..d5dc381 100644
--- a/answers/exercise10.sql
+++ b/answers/exercise10.sql
@@ -0,0 +1 @@
+SELECT * FROM Students WHERE city IN ('Philadelphia', 'Trenton');
\ No newline at end of file
diff --git a/answers/exercise11.sql b/answers/exercise11.sql
index e69de29..9c0584c 100644
--- a/answers/exercise11.sql
+++ b/answers/exercise11.sql
@@ -0,0 +1 @@
+SELECT * FROM Students ORDER BY city;
\ No newline at end of file
diff --git a/answers/exercise12.sql b/answers/exercise12.sql
index e69de29..10bad7d 100644
--- a/answers/exercise12.sql
+++ b/answers/exercise12.sql
@@ -0,0 +1 @@
+SELECT * FROM Students ORDER BY city DESC;
\ No newline at end of file
diff --git a/answers/exercise13.sql b/answers/exercise13.sql
index e69de29..00f0498 100644
--- a/answers/exercise13.sql
+++ b/answers/exercise13.sql
@@ -0,0 +1 @@
+SELECT * FROM Students ORDER BY country, city;
\ No newline at end of file
diff --git a/answers/exercise14.sql b/answers/exercise14.sql
index e69de29..b678133 100644
--- a/answers/exercise14.sql
+++ b/answers/exercise14.sql
@@ -0,0 +1 @@
+SELECT * FROM Students WHERE postal_code IS NULL;
\ No newline at end of file
diff --git a/answers/exercise15.sql b/answers/exercise15.sql
index e69de29..0181208 100644
--- a/answers/exercise15.sql
+++ b/answers/exercise15.sql
@@ -0,0 +1 @@
+SELECT * FROM Students WHERE postal_code IS NOT NULL;
\ No newline at end of file
diff --git a/answers/exercise16.sql b/answers/exercise16.sql
index e69de29..91ed076 100644
--- a/answers/exercise16.sql
+++ b/answers/exercise16.sql
@@ -0,0 +1 @@
+UPDATE Students SET city = 'Edinburgh';
\ No newline at end of file
diff --git a/answers/exercise17.sql b/answers/exercise17.sql
index e69de29..7f0ef88 100644
--- a/answers/exercise17.sql
+++ b/answers/exercise17.sql
@@ -0,0 +1 @@
+UPDATE Students SET city = 'Edinburgh' WHERE country = 'Scotland';
\ No newline at end of file
diff --git a/answers/exercise18.sql b/answers/exercise18.sql
index e69de29..283f197 100644
--- a/answers/exercise18.sql
+++ b/answers/exercise18.sql
@@ -0,0 +1 @@
+UPDATE Students SET (city = 'Edinburgh', country = 'Scotland') WHERE student_id = 35;
\ No newline at end of file
diff --git a/answers/exercise19.sql b/answers/exercise19.sql
index e69de29..1a5f094 100644
--- a/answers/exercise19.sql
+++ b/answers/exercise19.sql
@@ -0,0 +1 @@
+DELETE FROM Students WHERE country = "Scotland";
\ No newline at end of file
diff --git a/answers/exercise2.sql b/answers/exercise2.sql
index e69de29..e7487f3 100644
--- a/answers/exercise2.sql
+++ b/answers/exercise2.sql
@@ -0,0 +1 @@
+DROP DATABASE myNewDB;
\ No newline at end of file
diff --git a/answers/exercise20.sql b/answers/exercise20.sql
index e69de29..5c66fd1 100644
--- a/answers/exercise20.sql
+++ b/answers/exercise20.sql
@@ -0,0 +1 @@
+DELETE FROM Students;
\ No newline at end of file
diff --git a/answers/exercise3.sql b/answers/exercise3.sql
index e69de29..252aadc 100644
--- a/answers/exercise3.sql
+++ b/answers/exercise3.sql
@@ -0,0 +1,7 @@
+CREATE TABLE Users(
+    user_id     INT PRIMARY KEY,
+    last_name   VARCHAR(255),
+    first_name  VARCHAR(255),
+    address_     VARCHAR(255),
+    city        VARCHAR(255)
+);
\ No newline at end of file
diff --git a/answers/exercise4.sql b/answers/exercise4.sql
index e69de29..fe6a7f5 100644
--- a/answers/exercise4.sql
+++ b/answers/exercise4.sql
@@ -0,0 +1 @@
+DROP TABLE Users;
\ No newline at end of file
diff --git a/answers/exercise5.sql b/answers/exercise5.sql
index e69de29..f1ad85c 100644
--- a/answers/exercise5.sql
+++ b/answers/exercise5.sql
@@ -0,0 +1 @@
+TRUNCATE TABLE myNewDb.Users;
\ No newline at end of file
diff --git a/answers/exercise6.sql b/answers/exercise6.sql
index e69de29..de11c56 100644
--- a/answers/exercise6.sql
+++ b/answers/exercise6.sql
@@ -0,0 +1,2 @@
+ALTER TABLE Users
+ADD Birthday DATE;
diff --git a/answers/exercise7.sql b/answers/exercise7.sql
index e69de29..9efcc54 100644
--- a/answers/exercise7.sql
+++ b/answers/exercise7.sql
@@ -0,0 +1,2 @@
+ALTER TABLE Users
+DROP COLUMN birthday;
\ No newline at end of file
diff --git a/answers/exercise8.sql b/answers/exercise8.sql
index e69de29..22511c3 100644
--- a/answers/exercise8.sql
+++ b/answers/exercise8.sql
@@ -0,0 +1,11 @@
+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');
\ No newline at end of file
diff --git a/answers/exercise9.sql b/answers/exercise9.sql
index e69de29..8d6bd5e 100644
--- a/answers/exercise9.sql
+++ b/answers/exercise9.sql
@@ -0,0 +1 @@
+SELECT * FROM Students WHERE NOT city = 'Philadelphia';
\ No newline at end of file