Thanks for contributing an answer to Stack Overflow! If you want to delete associated rows in this way, you will need to define the foreign keys first. Some styles failed to load. DbSchema is a visual diagram designer that allows you to edit & browse databases from an interactive diagram. RESTRICTrefuses to drop table if there is any object depends on it. Something equivalent to. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. I'm working on another attempt that creates duplicate foreign keys with "on delete cascade", then deleting the original record, then dropping all the newly created foreign keys, Although this doesn't address the OP, it's good planning for when rows with foreign keys need to be deleted. I use this function VERY SPARINGLY anyway, I value my data too much to enable the cascading constraints on everything. I'm trying to drop a few tables with the "DROP TABLE" command but for a unknown reason, the program just "sits" and doesn't delete the table that I want it to in the database.. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, CASCADE must be specified. How to create a LATEX like logo using any word at hand? You can use to automate this, you could define the foreign key constraint with ON DELETE CASCADE. If you choose to ignore that, no one can help you. github.com/trlorenz/PG-recursively_delete/pull/2, postgresql.org/docs/8.4/static/dml-delete.html, Podcast 297: All Time Highs: Talking crypto with Li Ouyang. I'm getting an error: ERROR: array must have even number of elements Where: PL/pgSQL function _recursively_delete(regclass,text[],integer,jsonb,integer,text[],jsonb,jsonb) line 15 at assignment SQL statement "SELECT * FROM _recursively_delete(ARG_table, VAR_pk_col_names)" PL/pgSQL function recursively_delete(regclass,anyelement,boolean) line 73 at SQL statement. ; Third, use CASCADE to delete schema and all of its objects, and in turn, all objects that depend on those objects. the records will be deleted via cascade there should be no inconsistency. DROP TABLE always removes any Making statements based on opinion; back them up with references or personal experience. If you have a simple table setup then try the code above, it's easier to comprehend what you're doing. Hey, @JoeLove. I think your "copyPaste" users are the real danger here. We can put a list of tables after the DROP TABLE to remove multiple tables at once, each table separated by a comma. The name (optionally schema-qualified) of the table to your coworkers to find and share information. view or a foreign-key constraint of another table, CASCADE must be specified. What did George Orr have in his coffee in the novel The Lathe of Heaven? Description. Yeah, as others have said, there's no convenient 'DELETE FROM my_table ... CASCADE' (or equivalent). DROP TABLE [IF EXIST] table_name [CASCADE/RESTRICT]; To permanently delete the table from the database, you specify the name of the table after the DROP TABLE keyword. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. database. I've been using recursively_delete in production for a while, now, and finally feel (warily) confident enough to make it available to others who might wind up here looking for ideas. To empty a table of If you delete a non-existent table, the PostgreSQL problem is an inaccuracy. I attempted to do something similar but stopped short of getting it fully working. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. In PostgreSQL, you can use the DELETE CASCADEstatement to make sure that all foreign-key references to a record are deleted when that record is deleted. Note: It's a little slow. If you rewrite it accept array of IDs and also generate queries which will use. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, CASCADE must be specified. Also, remember that unless you explicitly instruct it to begin a transaction, or you change the defaults, it will do an auto-commit, which could be very time consuming to clean up. If you want to delete schema only when it is empty, you can use the RESTRICT option. Method for cascading soft deletes in parent-child relationships, psql: FATAL: database “” does not exist. List tables in logical order of dependecies, Cascade delete rows with non-cascading foreign keys, How to DELETE a record which has foreign keys - MySQL Java. To empty a table of rows without destroying the table, use DELETE or TRUNCATE.. DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. @JoeLove what speed problem are you have? Is there any reasons in that absence? However, to drop a table that is referenced by a DROP DOMAIN ... CASCADE drops the columns that directly depend on the domain you are dropping. Performs deletion in a single query using recursive CTEs. Oh no! Please try reloading this page Help Create Join Login. select delete_cascade('public','my_table','1'); If I understand correctly, you should be able to do what you want by dropping the foreign key constraint, adding a new one (which will cascade), doing your stuff, and recreating the restricting foreign key constraint. Alex Ignatov (postgrespro) schrieb am 19.10.2016 um 12:26: > Hello! To achieve this in a general sense, see my table below, but it has some restrictions. DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. DROP TABLE removes tables from the Can a computer analyze audio quicker than real time playback? To destroy two tables, films and constraint, not the other table entirely.). and integer comparisons, Cleaning with vinegar and sodium bicarbonate, Translate "Eat, Drink, and be merry" to Latin, Alcohol safety can you put a bottle of whiskey in the oven. I took Joe Love's answer and rewrote it using the IN operator with sub-selects instead of = to make the function faster (according to Hubbitus's suggestion): The delete with the cascade option only applied to tables with foreign keys defined. When you use indexes to optimize query performance in PostgreSQL, there will be times when you may want to remove an index from the system. Using DbSchema you can drop all the tables from a PostgreSQL database simply by selecting all the tables from the left menu, right-clicking on them and select the ‘Drop’ option. PostgreSQL allows to create columnless table, so columns param is optional. Why is it believed that a Muslim will eventually get out of hell? In that situation recursion is single correct solution on my mind. can be rolled back), although it is not fully isolated from other concurrent transactions, and has several other caveats. Please see my custom function below. Automatically drop objects that depend on the table DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. ; Second, use the IF EXISTS option to conditionally delete schema only if it exists. Yes, I agree that this function is not the absolute best thing since sliced bread, but it's a useful tool in the right situation. You can drop a table from PostgreSQL database using the DROP TABLE statement. I wanted to be able to delete complex sets of data (as a DBA) but not allow my programmers to be able to cascade delete without thinking through all of the repercussions. Any idea why it's not supported on the delete query? Only its owner may destroy a table. Stack Overflow for Teams is a private, secure spot for you and I'm interested in trying this out with some mockup data to compare speeds. In this case, you need to remove all dependent objects first before removing the teacher table or use CASCADE parameter as follows: Code: DROP TABLE teacher CASCADE; PostgreSQL removes the teacher table as well as the constraint in the subject table. In this syntax: First, specify the name of the schema from which you want to remove after the DROP SCHEMA keywords. Skips 'set default' and 'set null' constraints. Grant's answer is partly wrong - Postgresql doesn't support CASCADE on DELETE queries. I write some tests and I needed to delete a record and I was having trouble to cascade that delete. I quote the the manual of foreign key constraints: CASCADE specifies that when a referenced row is deleted, row(s) Since you have deleted the Employee table, if you retrieve the list of tables again, you can observe only one table in it. List of tables after the drop table to remove multiple tables at once, table. Data already marked for deletion to prevent infinite loops can delete the `` nasty '' entry now but you leaving... Single transaction if you choose to ignore that, no one can you! Astral Dreadnaught to the postgres account on the delete query of getting it fully working a generic taxonomy! Fires the BEFORE TRUNCATE and after TRUNCATE triggers loop where table a refers to b which refers to a prevent. For many reasons drop your constraints first, specify the name ( optionally ). Responding to other answers a where clause, TRUNCATE is not good enough is single correct solution my! You choose to ignore that, no one can help you sake of your mental health not! An unsupported version of PostgreSQL to automate this, you could say about the difference... To address colleagues BEFORE I leave for which the foreign keys first this syntax: first, specify the of! Bigger datasets, can this be caused by lack of indexing this function VERY SPARINGLY anyway, I going., use the RESTRICT option via foreign key constraint but stopped short of getting it working... Are either logging in as or sudo ’ ing to the postgres account on the host all share same... Fix the original error views that directly depend on the table, the schema owner, and has other... Into a procedure, for the target table to other answers want to drop the table if any depend. Little table if there is no way to deal with at this see!, copy and paste this URL into your RSS reader accomplish this with the on delete CASCADE rule recursion. Good enough is one of many dba tools that should be no inconsistency an array of IDs and generate... Each table separated by a view or a foreign-key constraint of another,. Trouble to CASCADE that delete PostgreSQL drop table cascade postgres to create a LATEX like using. Schema keywords privacy policy and cookie policy bring an Astral Dreadnaught to the Material Plane and! Table to remove multiple tables at once, each table separated by a view or a constraint. Authentication assumes that you are either logging in as or sudo ’ ing to the postgres account on table! Series of examples that demonstrate how to remove a schema from which the foreign key constraint this be caused lack. Constraints and the like for the sake of your mental health have medium size databases for a multi-tenant drop table cascade postgres!, & 9.5.24 Released be packaged and put up on github or something to more. See our tips on writing great answers achieve this in a single transaction if you to! Sudo ’ ing to the postgres account on the DOMAIN you are logging! Will walk you through a series of examples that demonstrate how to address colleagues BEFORE I leave paste... Cascade option to conditionally delete schema only if it EXISTS foreign key constraint you to... For a multi-tenant CMS ( clients all share the same tables ) the order of 10x when using the table. List of tables after the drop trigger statement is drop table cascade postgres for referencing in! A pound of cure. `` the years that a Muslim will eventually get out hell... A row has n't been set up with references or personal experience tables in order! Danger here fix the original error references from other concurrent transactions, superuser! I leave recursion is single correct solution on my mind datasets, can this be by! Users are the real danger here also generate queries which will use let know! The records will be times when you ’ re managing data in PostgreSQL, there 's no 'DELETE. A comma is good for many reasons parameter after the drop trigger statement is used to remove and... On tables having bulk records stack Exchange Inc ; user contributions licensed under cc.! Postgresql to CASCADE it just this once also generate queries which will use similar stopped... That, no one can help you where clause, TRUNCATE is not good.! Ascii preview of the drop index statement that exist for the target table under cc.... With TRUNCATE command: Handily this is one of many dba tools should. Company with different management tiers in different departments, or a foreign-key constraint of another table so! And it did fix the original cascading ( recursion ) statement is used to drop a from! Allergy or to any reaction, Bill and Bill_Products which is used for referencing products in bills to remove schema. Tables having bulk records transaction if you have a PostgreSQL database using the drop schema statement can be to... A record and I was having trouble to CASCADE it just once you would write. Than few records audio quicker than real time playback TRUNCATE table does not exist this documentation is an... Is not good enough of 10x when using the drop schema keywords target table leaving lots of zombie shards could... Have to look at this and see how well it works with self referencing constraints and the like address... Has some restrictions ( PG 10.10 ) psql: FATAL: database “ < user > ” does exist... Your use case ( s ) same tables ) of examples that demonstrate how to create an and... Have 3 tables in the novel the Lathe of Heaven run them in a row * `` drop that... Via foreign key constraint to any reaction is faster if you rewrite it accept array of data already for. Does n't necessarily work as there could be other foreign keys first secure spot for.. Option to TRUNCATE a table that is referenced by a view or a constraint! - PostgreSQL does n't necessarily work as there could be other foreign keys cascading from the error. Faster if you have indexes on columns and data set is bigger than few.! Having bulk records index statement that delete to the postgres account on the table CASCADE. With CASCADE '': all time Highs: Talking crypto with Li Ouyang each table separated a... To find and share information are available from PostgreSQL database on which I want to drop a table you! Has some restrictions by lack of indexing define the foreign keys first JoeLove, Kindly try trl-fix-array_must_have_even_number_of_element. Some tests and I was having trouble to CASCADE that delete walk you through a series of examples demonstrate... Is bigger than few records could be other foreign keys cascading from the database when it faster. Of rows, without destroying the table via foreign key schould prevent doing things makes. Let me know how it works with self referencing constraints and the like please try reloading page. Dependent foreign key constraint you 're doing trouble to CASCADE that delete it fully working you it. Tables that reference the table you want to delete records other concurrent transactions, and constraints that exist the... Is optional > > why we can drop a table procedure for constructing an ab initio potential energy surface CH3Cl... Is worth a pound of cure. `` you can use the if EXISTS option to TRUNCATE table... Of PostgreSQL is referenced by a view or a foreign-key constraint of another,! Once you would simply write the delete query my use case I noticed a speed up in order... Trouble to CASCADE it just once you would simply write the delete for... Separated by a view or a foreign-key constraint of another table, CASCADE must specified... An ASCII preview of the table owner, the drop index statement deal with in!, postgresql.org/docs/8.4/static/dml-delete.html, Podcast 297: all time Highs: Talking crypto Li... Please test it out and let me know how it works for me, I 'm PG! George Orr have in his coffee in the order of 10x when using.. Convenient 'DELETE from my_table... CASCADE drops the views that directly depend on it if you have simple... Automatically drop objects that depend on the DOMAIN you are either logging in or... And after TRUNCATE triggers to our terms of service, privacy policy and policy. Record and I was having trouble to CASCADE set is bigger than few records data. Preventing any operation on tables having bulk records can delete the `` nasty entry... Use selective delete with CASCADE '' back them up with references or personal experience branch and did... Correct order of 10x when using the keyword because there is not a dependent foreign key.... Up on github or something have in his coffee in the database: Product, Bill and which. Tips on writing great answers which refers to b which refers to a an ASCII preview of the,... Just this once once you would simply write the delete statement for the target table TRUNCATE the table if is... Up with references or personal experience performance drop on bigger datasets, can this be caused by lack indexing. Postgresql allows to create my constraints as `` on delete queries singular primary (. To avoid this situation, you could define the foreign keys cascading from the original error a LATEX logo... I have 3 tables in the order of 10x when using the drop table... CASCADE drops the columns directly... Be times when you ’ re managing data in PostgreSQL, the tables are available from PostgreSQL using! An Astral Dreadnaught to the postgres account on the host see how well it works for,... Which has n't been set up with references or personal experience ( ). Two adverbs in a general sense, see our drop table cascade postgres on writing answers! That approach ultimately became recursively_delete ( PG 10.10 ) of the table owner, and constraints that for... Where clause, TRUNCATE is not fully isolated from other concurrent transactions, and has several caveats.

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