Alter the USERS table to change the primary key to Email to ensure uniqueness based on email addresses.

Question

Alter the USERS table to change the primary key to Email to ensure uniqueness based on email addresses.

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Solution

To alter the USERS table and change the primary key to Email, you would use the following SQL commands:

Step 1: First, you need to drop the existing primary key. Let's assume the current primary key is UserID.

ALTER TABLE USERS
DROP PRIMARY KEY;

Step 2: Then, you need to add the new primary key, which is Email.

ALTER TABLE USERS
ADD PRIMARY KEY (Email);

Please note that all email values must be unique and not null before setting it as a primary key. If there are duplicate or null values, you will need to handle them before running the above commands.

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Alter the USERS table to change the primary key to Email to ensure uniqueness based on email addresses.

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