How do I specify unique constraint for multiple columns in MySQL?
I have a table:
table votes (
id,
user,
email,
address,
primary key(id),
);
Now I want to make the columns user, email, address unique (together).
How do I do this in MySql?
- Of course the example is just... an example. So please don't worry about the semantics.
1Answer
ALTER TABLE `votes` ADD UNIQUE `unique_index`(`user`, `email`, `address`);
- answered 8 years ago
- G John
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