diff --git a/lsqlthw-remnants/ex13-queries.sql b/lsqlthw-remnants/ex13-queries.sql
new file mode 100644
index 0000000..ed811de
--- /dev/null
+++ b/lsqlthw-remnants/ex13-queries.sql
@@ -0,0 +1,15 @@
+SELECT
+    pet.name,
+    person.first_name,
+    person.last_name,
+    person_pet.purchased_on
+FROM pet, person, person_pet
+WHERE
+    person_pet.purchased_on >= DATETIME('2004-01-01 00:00:00')
+    AND person_pet.pet_id = pet.id
+    AND person_pet.person_id = person.id;
+
+SELECT pet.name
+FROM pet, person
+WHERE pet.parent = person.id
+    AND person.first_name = 'Zed';
diff --git a/lsqlthw-remnants/ex13.sql b/lsqlthw-remnants/ex13.sql
new file mode 100644
index 0000000..0a6163b
--- /dev/null
+++ b/lsqlthw-remnants/ex13.sql
@@ -0,0 +1,141 @@
+ALTER TABLE person ADD COLUMN dead INTEGER;
+
+ALTER TABLE person ADD COLUMN phone_number TEXT;
+
+ALTER TABLE person ADD COLUMN salary FLOAT;
+
+ALTER TABLE person ADD COLUMN dob DATETIME;
+
+ALTER TABLE pet ADD COLUMN dob DATETIME;
+
+ALTER TABLE person_pet ADD COLUMN purchased_on DATETIME;
+
+ALTER TABLE pet ADD COLUMN parent INTEGER;
+
+UPDATE pet
+SET parent = 0
+WHERE id IN (
+    SELECT pet_id
+    FROM person_pet
+    WHERE person_id = 0
+);
+
+UPDATE person_pet
+SET purchased_on = DATETIME('now')
+WHERE person_id = 0;
+
+INSERT INTO person (
+    id, first_name, last_name, age, dob,
+    dead, phone_number, salary
+)
+VALUES (
+    1, 'Fred', 'Shub', 43, DATETIME('1971-12-23 11:23:00'),
+    0, '4128898282', 45390.80
+);
+
+INSERT INTO person (
+    id, first_name, last_name, age, dob,
+    dead, phone_number, salary
+)
+VALUES (
+    2, 'Alice', 'Blurb', 27, DATETIME('1987-02-03 01:15:00'),
+    0, '7243871222', 89500.00
+);
+
+INSERT INTO person (
+    id, first_name, last_name, age, dob,
+    dead, phone_number, salary
+)
+VALUES (
+    3, 'Regina', 'Nerp', 19, DATETIME('1995-09-12 19:04:00'),
+    0, '4154401190', 142880.70
+);
+
+INSERT INTO person (
+    id, first_name, last_name, age, dob,
+    dead, phone_number, salary
+)
+VALUES (
+    4, 'Sam', 'Wut', 59, DATETIME('1955-10-25 21:31:10'),
+    0, '4125511328', 62422.00
+);
+
+INSERT INTO pet (
+    id, name, breed, age, dead,
+    dob, parent
+)
+VALUES (
+    2, 'Hanky', 'Bone', 94, 0,
+    DATETIME('1920-03-14 04:13:00'), 4
+);
+
+INSERT INTO pet (
+    id, name, breed, age, dead,
+    dob, parent
+)
+VALUES (
+    3, 'Rhonda', 'Guinea Pig', 1, 0,
+    DATETIME('2013-01-11 00:00:00'), 2
+);
+
+INSERT INTO pet (
+    id, name, breed, age, dead,
+    dob, parent
+)
+VALUES (
+    4, 'Tippy', 'Dog', 18, 1,
+    DATETIME('1996-10-04 00:00:00'), 1
+);
+
+INSERT INTO pet (
+    id, name, breed, age, dead,
+    dob, parent
+)
+VALUES (
+    5, 'Chuck', 'Parakeet', 3, 0,
+    DATETIME('2010-07-05 00:00:00'), 3
+);
+
+INSERT INTO pet (
+    id, name, breed, age, dead,
+    dob, parent
+)
+VALUES (
+    6, 'Sal', 'Horse', 8, 0,
+    DATETIME('2006-05-21 00:00:00'), 2
+);
+
+INSERT INTO person_pet (
+    person_id, pet_id, purchased_on
+)
+VALUES (
+    2, 6, DATETIME('2007-03-11 00:00:00')
+);
+
+INSERT INTO person_pet (
+    person_id, pet_id, purchased_on
+)
+VALUES (
+    4, 2, DATETIME('1955-11-05 00:00:00')
+);
+
+INSERT INTO person_pet (
+    person_id, pet_id, purchased_on
+)
+VALUES (
+    2, 3, DATETIME('2013-09-01 00:00:00')
+);
+
+INSERT INTO person_pet (
+    person_id, pet_id, purchased_on
+)
+VALUES (
+    1, 4, DATETIME('1999-01-25 00:00:00')
+);
+
+INSERT INTO person_pet (
+    person_id, pet_id, purchased_on
+)
+VALUES (
+    3, 5, DATETIME('2010-12-15 00:00:00')
+);