Let's look at an example of how to add a unique constraint to an existing table in PostgreSQL using the ALTER TABLE statement. The error correctly translated would have shown you the issue: ERROR: relation "serveurs_domain" already exists. queryInterface.sequelize.query(`ALTER TABLE abc DROP CONSTRAINT IF EXISTS "someId_foreign_idx"`); The catalog pg_class catalogs tables and most everything else that has columns or is otherwise similar to a table. To learn more, see our tips on writing great answers. Drop constraint from Sequelize model. Did Elon Musk falsely claim to have a degree in science? 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FYI, it is a good habit to do: In which case a NOTICE not a ERROR is thrown. queryInterface.removeConstraint() now exists! ERROR: constraint serveurs_domain of relation serveurs does not exist, ERROR: constraint serveurs_domain already exists, PostgreSQL 13.8 (Debian 13.8-0+deb11u1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 10.2.1-6) 10.2.1 20210110, 64-bit. Thanks for contributing an answer to Stack Overflow! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Stack Overflow for Teams is moving to its own domain! To force the command waits until the conflicting transaction completes before removing the index, you can use the CONCURRENTLY option. Making statements based on opinion; back them up with references or personal experience. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. The DROP INDEX CONCURRENTLY has some limitations: First . sql - PostgreSQL - Cannot drop unique constraint because it doesn't How can I solve Postgresql SCRAM authentication problem? How is it possible that when I try to add a unique constraint named "serveurs_domain" it says I can't because the constraint already exists. Connect and share knowledge within a single location that is structured and easy to search. I have 5kV available to create a spark. Is limiting the current to 500A as simple as putting a 10M resistor in series? It throws error, can't find constraint with particular name, even though i have one. UNIQUE Constraint not working? rev2022.12.2.43073. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Postgres DROP CONSTRAINT IF EXISTS returns error instead of - GitHub How to numerically integrate Kepler Problem? Perhaps the constraint "serveurs_domain" exists on another table. 1 Answer. Transposing columns into rows in QGIS Attribute table, How to perform and shine in a team when the boss is too busy to manage. sql - How to drop constraints in postgres? - Stack Overflow GitHub Gist: instantly share code, notes, and snippets. Short-term options to mitigate burnout and demotivation while working with painful colleague. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters, http://docs.sequelizejs.com/class/lib/query-interface.js~QueryInterface.html#instance-method-removeConstraint. Clone with Git or checkout with SVN using the repositorys web address. Why can I not buy fractional stock, but see fractional amounts vested? Instantly share code, notes, and snippets. It seems you want to drop the constraint, only if it exists. ALTER TABLE order_details ADD CONSTRAINT order_unique UNIQUE (order_id); In this example, we've created a unique constraint on the existing order_details table called order_unique. PostgreSQL DROP INDEX Statement In Postgres you can use: ALTER TABLE custom_table DROP CONSTRAINT IF EXISTS fk_states_list; You can also make sure the table exists: ALTER TABLE IF EXISTS custom_table DROP CONSTRAINT IF EXISTS fk_states_list; Share. BUT, when I try to drop the constraint " Find centralized, trusted content and collaborate around the technologies you use most. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Not the answer you're looking for? PostgreSQL: DROP CONSTRAINT IF EXISTS To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to perform Low rank (Cholesky-like) factorization, and what is it called? Replacing 1960s Motor Capacitor - Vintage Sewing Machine. When you execute the DROP INDEX statement, PostgreSQL acquires an exclusive lock on the table and block other accesses until the index removal completes. Why use a tube for post footings instead of directly pouring concrete into the hole? This includes indexes (but see also pg_index), sequences (but see also pg_sequence), views, materialized views, composite types, and TOAST tables; see relkind. Why was Japan's second goal deemed to be valid? 'ALTER TABLE "project" DROP CONSTRAINT IF EXISTS project_name_key;'. Does the kernel of Windows 95/98/ME have a name? BUT, when I try to drop the constraint "serveurs_abbr" it says it doesn't exist. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How is it possible that when I try to add a unique constraint named "serveurs_domain" it says I can't because the constraint already exists. You signed in with another tab or window. Not all columns are meaningful for all relation types. The (Postgresql). The sql statement 'ALTER TABLE <table name> DROP CONSTRAINT IF EXISTS <constraint-name>' returns with a syntax error on exists. Can I interpret logistic regression coefficients and their p-values even if model performance is bad? It consists of the field called order_id. How can I fix chips out of painted fiberboard crown moulding and baseboards? http://docs.sequelizejs.com/class/lib/query-interface.js~QueryInterface.html#instance-method-removeConstraint, queryInterface.removeConstraint() doesn't work for me. PostgreSQL: Unique Constraints - TechOnTheNet Is there a rule for spending downtime to get info on a monster? Sorted by: 74. Below, when we mean all of these kinds of objects we speak of relations. Asking for help, clarification, or responding to other answers. So you are trying to reuse an existing index(relation) name and that won't work. 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