ALTER TABLE student ADD CONSTRAINT courseId_FK FOREIGN KEY (courseId) REFERENCES course (courseId), given this code explain in detail what it does.1.0 MarksThe above code is adding a constraint called courseId_FK which is going to be a foreign key, the constraint is going to get its values from the course table in courseId field.An alter statement is being made in the student table to add a constraint to the table the name of the constraint being added is courseId_FK, in the same table courseId is being set as the foreign key and it's values are be found or gotten from course table and courseId field.An alter statement is being made in the student table to add a constraint to the table the name of the constraint being added is courseId_FK, in the same table courseId is being set as the foreign key and it's values are be found or gotten from student table and courseId field.The above code is adding a constraint called courseId_FK which is going to be a foreign key, the constraint is going to get its values from the student table in courseId field.
Question
ALTER TABLE student ADD CONSTRAINT courseId_FK FOREIGN KEY (courseId) REFERENCES course (courseId), given this code explain in detail what it does.1.0 MarksThe above code is adding a constraint called courseId_FK which is going to be a foreign key, the constraint is going to get its values from the course table in courseId field.An alter statement is being made in the student table to add a constraint to the table the name of the constraint being added is courseId_FK, in the same table courseId is being set as the foreign key and it's values are be found or gotten from course table and courseId field.An alter statement is being made in the student table to add a constraint to the table the name of the constraint being added is courseId_FK, in the same table courseId is being set as the foreign key and it's values are be found or gotten from student table and courseId field.The above code is adding a constraint called courseId_FK which is going to be a foreign key, the constraint is going to get its values from the student table in courseId field.
Solution
The given code is a SQL command that modifies the structure of the 'student' table in a database. Here's a step-by-step explanation of what it does:
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ALTER TABLE student: This part of the code is used to modify the structure of an existing 'student' table. -
ADD CONSTRAINT courseId_FK: This part is adding a new constraint to the 'student' table. A constraint is a rule that's applied to the data in the table. In this case, the constraint is named 'courseId_FK'. -
FOREIGN KEY (courseId): This part is specifying that the new constraint is a foreign key constraint, and it's being applied to the 'courseId' column of the 'student' table. A foreign key is a column or a set of columns used to establish a link between the data in two tables. In this case, the 'courseId' column in the 'student' table is being linked to a column in another table. -
REFERENCES course (courseId): This part is specifying which table and column the 'courseId' foreign key is linked to. In this case, it's linked to the 'courseId' column in the 'course' table. This means that for each record in the 'student' table, the value of 'courseId' must also exist in the 'course' table.
In summary, this code is adding a rule to the 'student' table that links the 'courseId' column in the 'student' table to the 'courseId' column in the 'course' table. This ensures data integrity, as it prevents students from being assigned to non-existent courses.
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