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Yes, you can add a unique constraint after the fact Creating this index on the background while holding an access exclusive is the problem we are trying to avoid. This article explains how to add a unique constraint after already having created a table in postgresql

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In postgresql, the unique constraint prevents the duplication of values in a column, enforcing data uniqueness and integrity Postgresql automatically creates a unique index when a unique constraint or primary key is defined for a table This tutorial delves into setting unique constraints in postgresql with practical examples.

The unique constraint ensures that the values of a column must be unique and not a duplicate value

The following will set the unique constraint on the email column of the employee table. Let's look at an example of how to add a unique constraint to an existing table in postgresql using the alter table statement In this example, we've created a unique constraint on the existing order_details table called order_unique It consists of the field called order_id.

To make a column unique in a postgresql table, you can use the alter table statement with the add constraint clause Here's an example sql statement Add constraint unique_column_name unique (column_name); You can define a unique constraint across multiple columns (composite key), ensuring that the combination of values across these columns is unique

Postgresql allows the deferring of unique constraints using the 'deferrable' and 'initially deferred' keywords.