Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
| Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
| modul:m290:learningunits:lu05:aufgaben:03 [2024/09/27 13:16] – vdemir | modul:m290:learningunits:lu05:aufgaben:03 [2024/10/17 12:42] (aktuell) – vdemir | ||
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| Zeile 1: | Zeile 1: | ||
| - | ====== | + | ====== |
| ===== Requirements | ===== Requirements | ||
| Zeile 17: | Zeile 17: | ||
| Create a table books that has a book_id as a unique identifier for each book, with book_id as the primary key. Include columns for book_title (VARCHAR) and author_name (VARCHAR). The book_id should be an integer and cannot be NULL. | Create a table books that has a book_id as a unique identifier for each book, with book_id as the primary key. Include columns for book_title (VARCHAR) and author_name (VARCHAR). The book_id should be an integer and cannot be NULL. | ||
| - | ==== B: FOREIGN KEY ==== | + | ==== B: AUTO INCREMENT |
| - | Create | + | Create a table products where each product has an automatically generated, unique product_id using the AUTO_INCREMENT feature. Include columns for product_name and price. |
| ==== C: NOT NULL ==== | ==== C: NOT NULL ==== | ||
| Create a table students that includes a student_id (INT) and a student_name (VARCHAR). Ensure that the student_name column cannot have a NULL value by applying the NOT NULL constraint. | Create a table students that includes a student_id (INT) and a student_name (VARCHAR). Ensure that the student_name column cannot have a NULL value by applying the NOT NULL constraint. | ||
| - | ==== D: AUTO INCREMENT ==== | + | ==== D: UNIQUE ==== |
| - | Create a table products where each product has an automatically generated, unique product_id using the AUTO_INCREMENT feature. Include columns for product_name and price. | + | |
| - | + | ||
| - | ==== E: UNIQUE ==== | + | |
| Create a table users that has a user_id (INT) and email (VARCHAR). Ensure that no two users can have the same email address by applying the UNIQUE constraint to the email column. | Create a table users that has a user_id (INT) and email (VARCHAR). Ensure that no two users can have the same email address by applying the UNIQUE constraint to the email column. | ||
| + | |||
| + | ==== E: FOREIGN KEY ==== | ||
| + | Create two tables: one called departments and the other called employees. Each department has a department_id as its primary key. In the employees table, include a column called department_id as a foreign key that references the departments table. Ensure that every employee is linked to a department. | ||
| | | ||
| ===== Solution ===== | ===== Solution ===== | ||
| - | [[modul: | + | [[modul: |