I want to drop all constraints which are present in resultant table. Result of query is as follows : - ct_name | fg_tb_name | fg_cn_name | tb_name | cn_name |ĭata_ver_fk_cur | data_ver | cur | dimension | dim_id |ĭata_ver_fk_reg | data_ver | reg | dimension | dim_id |ĭata_ver_fk_ven | data_ver | ven | dimension | dim_id | It gives me list of tables and name of foreign key which are refrenced by 'dimension' table. WHERE constraint_type = 'FOREIGN KEY' AND ccu.table_name='dimension' AND ccu.table_schema='public' ON ccu.constraint_name = tc.constraint_name We have unfortunately not increased the maintenanceworkmem before running the SQL statement. JOIN information_nstraint_column_usage AS ccu We dropped a FK constraint on a column, but the statement has now been running for 48 hours and is still not complete. I wanted to remove all foreign key constraints from a schema. ON tc.constraint_name = kcu.constraint_name Start the applications and check if everything is in place. Foreign keys are stored on one side of the relation. SELECT tc.ctname, tc.tablename AS fgtbname, kcu.columnname AS fgcnname, ccu.tablename AS tbname, ccu. Creating Indexes Renaming Indexes Dropping Indexes Foreign Key Constraints. Following query is giving me the list of constraint. ALTER TABLE ONLY distributors DROP CONSTRAINT zipchk (The check constraint remains in place for any child tables. Creating Tables Updating Tables Renaming / Dropping Tables. Here is my query: IF EXISTS (SELECT FROM informationschema. In SQL, you use a foreign key to create a relation between two tables. Problem is that I want to drop foreign key constraint from tables which is referenced by given table. But its not working or I do something wrong. For instance, PRIMARY KEY CONSTRAINT, UNIQUE CONSTRAINT, FOREIGN KEY CONSTRAINT, CHECK CONSTRAINT, or NOT NULL CONSTRAINT. I want to delete a constraint only if it exists. Use the generated addingConstraints.sql SQL script to ADD the constraints back to the database. Talha Saif Malik Follow OpenSource Postgres PostgreSQL offers a DROP CONSTRAINT clause that allows us to drop any constraint from an existing table. Do the necessary changes in the database. JOIN information_schema.key_column_usage AS kcu Use the generated droppingConstraints.sql SQL script to DROP the constraints. Information_schema.table_constraints AS tc Tc.ct_name, tc.table_name AS fg_tb_name, kcu.column_name AS fg_cn_name, Following query is giving me the list of constraint. Problem is that I want to drop foreign key constraint from tables which is referenced by given table. 1 Answer Sorted by: 2 At time of writing (PostgreSQL 9. CASCADE to drop the dependent objects too.I am new to PostgreSQL. PostgreSQL said: cannot drop constraint unique_id_checkpoint on table checkpoint because other objects depend on itĭetail: constraint fk_vehiculo_checkpoint_idpunto on table vehiculo_checkpoint depends on index unique_id_checkpoint CASCADE to drop the dependent objects too. If you select a command, it lists the locks that it acquires, commands that. Talha Saif Malik Follow OpenSource Postgres PostgreSQL offers a DROP CONSTRAINT clause that allows us to drop any constraint from an existing table. But I cannot delete the UNIQUE CONSTRAINT as it is referenced by 2 FKs, as in the following messages: alter table checkpoint drop constraint unique_id_checkpoint ĮRROR: cannot drop constraint unique_id_checkpoint on table checkpoint because other objects depend on itĭETAIL: constraint fk_vehiculo_checkpoint_idpunto on table vehiculo_checkpoint depends on index unique_id_checkpointĬonstraint fk_geocelda_punto on table geocelda depends on index unique_id_checkpointĬonstraint fk_checkpoin_id on table ruta_checkpoint depends on index unique_id_checkpoint This tool shows all commands and locks in postgres. I have detected a duplicate index on an id field on one of our tables, as that column is the PK, but there's also a separate UNIQUE index on such column, which is useless. DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |