Alter the BOOKS table to change the primary key to Title to ensure each book is uniquely identified by its title.Drop the primary key from the BORROWERS table as it is no longer requiredAlter the AUTHORS table to change the Nationality to NULL
Question
Alter the BOOKS table to change the primary key to Title to ensure each book is uniquely identified by its title.Drop the primary key from the BORROWERS table as it is no longer requiredAlter the AUTHORS table to change the Nationality to NULL
Solution
To perform the operations you've mentioned, you can use the following SQL commands:
- Alter the BOOKS table to change the primary key to Title:
ALTER TABLE BOOKS
DROP CONSTRAINT books_pkey; -- Assuming books_pkey is the name of the primary key constraint
ALTER TABLE BOOKS
ADD PRIMARY KEY (Title);
- Drop the primary key from the BORROWERS table:
ALTER TABLE BORROWERS
DROP CONSTRAINT borrowers_pkey; -- Assuming borrowers_pkey is the name of the primary key constraint
- Alter the AUTHORS table to change the Nationality to NULL:
UPDATE AUTHORS
SET Nationality = NULL;
Please replace the constraint names with the actual names in your database. Also, be aware that changing the primary key to a text field like 'Title' could have performance implications and could cause issues if titles are not guaranteed to be unique or if they can change.
Similar Questions
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