Postgresql Add Unique Constraint

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Postgresql Add Unique Constraint

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Adding a unique constraint will automatically create a unique B tree index on the column or group of columns listed in the constraint A uniqueness restriction covering only some rows cannot be written as a unique constraint but it is possible to enforce such a restriction by creating a unique partial index Here is one way of adding a unique constraint to our users table for the email column alter table users add unique email This will add a constraint with the following description users email key UNIQUE CONSTRAINT btree email The name of the constraint was generated by Postgres It appended

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