DBS211 Lab 05 - DDL Solution

Objective:
The purpose of this lab is to introduce you to the DDL set of statements in SQL. By writing SQL to create tables, constraints, and views, you will have the tools needed to implement database designs that you will create later in the course. By finishing this lab, the student will be able to:
• create, modify, and drop tables based on design specifications provided,
• inserting new data into tables, update data in tables, and delete data from tables while considering referential integrity,
• enforce constraints on tables to ensure data integrity and consistency, • create a table using the structure and data from an existing table,
• import data into a table from other tables.
Submission:
Your submission should be submitted in a PDF file with the questions and solutions provided.
Your submission needs to include a comment header block and be commented to include the question and the solutions. Make sure every SQL statement terminates with a semicolon.
Tasks:
Add
SET AUTOCOMMIT ON;
under the comment header and execute it Consider the following table specifications:
Part A (DDL) :
1. Create table the following tables and their given constraints:
L5_MOVIES (movieid:int, title:varchar(35), year:int, director:int,score:decimal(3,2))
Column Name Column DataType PK Not Null Unique FK Default Value Validation
mid Int ✓
title varchar(35) ✓
releaseYear Int ✓
director Int ✓
score decimal(3,2) < 5 and > 0



L5_ACTORS (actorid:int, name:varchar(20), lastname:varchar(30))
Column Name Column DataType PK Not Null Unique FK Default Value Validation
aid Int ✓
firstName varchar(20) ✓
lastName Varchar(30) ✓

L5_CASTINGS (movieid:int, actorid:int)
Column Name Column DataType PK Not Null Unique FK Default Value Validation
movieid Int ✓ ✓ (movies)
actorid int ✓ ✓
(actors)

L5_DIRECTORS(id:int, name:varchar(20), lastname:varchar(30))
Column Name Column DataType PK Not Null Unique FK Default Value Validation
directorid Int ✓
firstname varchar(20) ✓
lastname varchar(30) ✓

2. Modify the movies table to create a foreign key constraint that refers to table directors.

3. Modify the movies table to create a new constraint so the uniqueness of the movie title is guaranteed.

4. Write insert statements to add the following data to table directors and movies.

Director
directorid First name Last name
1010 Rob Minkoff
1020 Bill Condon
1050 Josh Cooley
2010 Brad Bird
3020 Lake Bell


Movies
id title year director score
200 Beauty and the Beast 2017 1050 4.20

5. Write SQL statements to remove all above tables.
Is the order of tables important when removing? Why?
Part B (More DML):
6. Create a new empty table employee2 the same as table employees. Use a single statement to create the table and insert the data at the same time.

7. Modify table employee2 and add a new column username to this table. The value of this column is not required and does not have to be unique.

8. Delete all the data in the employee2 table.

9. Re-insert all data from the employees table into your new table employee2 using a single statement.

10. In table employee2, write a SQL statement to change the first name and the last name of employee with ID 1002 to your name.

11. In table employee2, generate the email address for column username for each student by concatenating the first character of employee’s first name and the employee’s last name. For instance, the username of employee Peter Stone will be pstone. NOTE: the username is in all lower case letters.

12. In table employee2, remove all employees with office code 4.

13. Drop table employee2.