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Postgres truncate table aka TRUNCATE TABLE, is the statement that can streamline managing the removal of table rows. The best approach would be disabling the constraints, but this does NOT work: I ahve seen similar questions on this site (truncate table with foreign keys, Truncate tables with dependent foreign key constraints), but no answer working for me. Because it doesn’t scan prior to deletion, it’s advantageous when you have large table data that you want to remove speedily. TRUNCATE TABLE. Truncate table with foreign key constraints, Truncate table with foreign key constraints. You however can't use TRUNCATE TABLE unqualified, if the table you are truncating has foreign key references from other tables. I've encountered deadlock with first transaction updating information field in the primary table, and second trasaction reloading secondary table using TRUNCATE and INSERT. Automatically truncate all tables that have foreign-key references to any of the named tables, or to any tables added to the group due to CASCADE. RESTRICT. What’s more, the removal of foreign key table … It performs the same function as a DELETE statement without a WHERE clause. By default, data within a table with references to foreign keys will not be removed by the PostgreSQL TRUNCATE TABLE clause. Warning : If you truncate a table, the TRUNCATE TABLE statement can not be rolled back unless it is within a transaction that has not been committed. When handling MySQL migrations or other testing instances on databases you often want to delete You can't truncate a table that has a foreign key constraint, that is the whole reason for having a constraint. The TRUNCATE TABLE statement is used to remove all records from a table or set of tables in PostgreSQL. This is the default. Refuse to truncate if any of the tables have foreign-key references from tables that are not listed in the command. RESTRICT. Automatically truncate all tables that have foreign-key references to any of the named tables, or to any tables added to the group due to CASCADE. Refuse to truncate if any of the tables have foreign-key references from tables that are not listed in the command. “Cannot truncate table because it is being referenced by a FOREIGN KEY constraint.” EXPLANATION: If you try to delete the contents of a table referenced as a FOREIGN KEY in another table with the TRUNCATE TABLE command, you will receive this message. CASCADE. Great article but please note that with a truncate you will need to disable all foreign key constraints associated with the tables primary key constraint Reply Ben on July 9, 2019 at 5:09 am The list of tables need to include all tables that are linked with a foreign key. If you specify CASCADE, then Oracle Database truncates all child tables that reference table with an enabled ON DELETE CASCADE referential constraint.This is a recursive operation that will truncate all child tables, granchild tables, and so on, using the specified options. In practice, tables typically have foreign-key references to other tables that are not included in the PostgreSQL TRUNCATE TABLE statement. How to Truncate All the Data from a Table with the Foreign-Key Reference using the PostgreSQL TRUNCATE Command. Oracle 12c introduced TRUNCATE ...CASCADE:. (5 replies) Hello. Truncate the table othertable, and cascade to any tables that reference othertable via foreign-key constraints: Compatibility Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly. In comes its extended form, the TRUNCATE TABLE .. CASCADE construct which was introduced in PostgreSQL 8.2, which will not only delete all data from the main table, but will CASCADE to all the referenced tables. This is the default. Alternatively you can just truncate the "top most" table with the cascade option: truncate table one cascade; This would automatically (and recursively) truncate all tables referencing table one.

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