PostgreSQL – How to Rename a Constraint

ByAdmin

You can rename a constraint in PostgreSQL database using the ALTER TABLE statement. Renaming a constraint is useful when you want to give it a more meaningful or descriptive name or if you need to change its name for any other reason. Here’s the basic syntax for renaming a constraint:

ALTER TABLE table_name RENAME CONSTRAINT old_constraint_name TO new_constraint_name;

where table_name is the name of the table where the constraint is defined.

old_constraint_name is the current name of the constraint that you want to rename.

new_constraint_name is the new name you want to give to the constraint.

Here’s an example of how you can use this syntax to rename a constraint. Consider a table named “employees” with a constraint named “check_age_gt_18” and you would like to rename it to “age_must_be_gt_18”. 

ALTER TABLE employees RENAME CONSTRAINT check_age_gt_18 TO age_must_be_gt_18;

After running this command, the constraint’s name will be changed from “check_age_gt_18” to “age_must_be_gt_18” while keeping its definition intact.

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