dincho / unitest

MSSQL course work

Online and up-to-date version can be found at: https://github.com/dincho/unitest

Setup

Run the docker image

docker run -d --name unitest unitest

Run sqlcmd

docker exec -it unitest /opt/mssql-tools/bin/sqlcmd -S localhost -U sa -P P@55w0rd

Schema import

:r schema.sql

Test Data

:r data.sql

List all tables in the database

SELECT TABLE_NAME FROM unitest.INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE';

Solutions

The solution has been implemented with total of 10 tables. For details see the EER Diagram below.

.

Triggers

Assessment answers denormalization

For easy reporting and for the sake of the example a trigger with name sync_assessment_answer is used to update assessment correct answers. The trigger itself calls SP UpdateAssessmentCorrectAnswers.

Questions limits

To enforce test limits set by max_questions and max_variants a trigger named limit_questions is setup for questions table inserts that checks and throw an error in case the limits are reached.

Search for test assessment by student and discipline

Examples

By student faculty number only:

EXEC FindAssessment @faculty_number = '111082';

By student faculty number only and discipline:

EXEC FindAssessment @faculty_number = '111082', @discipline = 'Computer networks and Internet';

Note that both parameters are wild-card, so the below example also works:

EXEC FindAssessment @faculty_number = '111', @discipline = 'Computer';

Results

+-----------------+----------+--------------------------------+----------+-------------------------+
| Student name    | Fac. #   | Discipline                     | Test     | Date taken              |
|-----------------+----------+--------------------------------+----------+-------------------------|
| Ivan Petrov     | 111082   | Computer networks and Internet | SQL Quiz | 2018-04-21 08:12:00.000 |
| Ivan Petrov     | 111082   | Computer networks and Internet | SQL Quiz | 2018-04-20 08:44:00.000 |
| Gabriela Geneva | 111083   | Computer networks and Internet | SQL Quiz | 2018-04-20 08:20:00.000 |
+-----------------+----------+--------------------------------+----------+-------------------------+

Average correct answers by test, question number and variant

Implemented with helper view correct_answers_view and wrapped in view avg_correct_answers_view.

Examples

SELECT * FROM avg_correct_answers_view;

Results

+----------+-----------+--------------------------------------------------------------------------------------+-----------------------+
| Test     | Variant   | Question                                                                             | avg_correct_answers   |
|----------+-----------+--------------------------------------------------------------------------------------+-----------------------|
| SQL Quiz | 1         | What does SQL stand for?                                                             | 0                     |
| SQL Quiz | 1         | Which SQL statement is used to extract data from a database?                         | 1                     |
| SQL Quiz | 1         | Which SQL statement is used to update data in a database?                            | 2                     |
| SQL Quiz | 2         | Which SQL statement is used to delete data from a database?                          | 0                     |
| SQL Quiz | 2         | Which SQL statement is used to insert new data in a database?                        | 1                     |
| SQL Quiz | 2         | With SQL, how do you select a column named "FirstName" from a table named "Persons"? | 1                     |
+----------+-----------+--------------------------------------------------------------------------------------+-----------------------+

Average question and variants by disciplines

Implemented with helper view tests_agg_view and wrapped in view disciplines_agg_view.

Examples

SELECT * FROM disciplines_agg_view;

Results

+--------------------------------+-----------------+----------------+
| name                           | avg_questions   | avg_variants   |
|--------------------------------+-----------------+----------------|
| Computer networks and Internet | 6               | 2              |
| Internet servers and services  | 5               | 1              |
+--------------------------------+-----------------+----------------+

Number of assessments with less than 50% success rate

Implemented with helper view success_rate_view and wrapped in SP NumberOfFailedAssessments.

Examples

SELECT * FROM success_rate_view WHERE success_rate < 50;

EXEC NumberOfFailedAssessments;

Results

+----------------------+
| failed_assessments   |
|----------------------|
| 5                    |
+----------------------+