Here’s the description from the PostgreSQL 8.1 docs: DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. This is the default. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, CASCADE must be specified. RESTRICTrefuses to drop table if there is any object depends on it. RESTRICT. Hi I encountered something that puzzled me a bit. The DROP table removes any indexes, rules, triggers, and obstacles that are present for the target table. We can put a list of tables after the DROP TABLE to remove multiple tables at once, each table separated by a comma. If you really want DELETE FROM some_table CASCADE; which means "remove all rows from table some_table", you can use TRUNCATE instead of DELETE and CASCADE is always supported. We can put a list of tables after the DROP TABLE to remove multiple tables at once, each table separated by a comma. PostgreSQL uses RESTRICT by default. Automatically drop objects that depend on the table (such as views). DROP CASCADE. The CASCADE option should be used with further consideration or you may potentially delete data from tables that you did not want.. By default, the TRUNCATE TABLE statement uses the RESTRICT option which prevents you from truncating the table that has foreign key constraint references.. PostgreSQL TRUNCATE TABLE and ON DELETE trigger. When you execute the DROP INDEX statement, PostgreSQL acquires an exclusive lock on the table and block other accesses until the index removal completes.. To force the command waits until the conflicting transaction completes before removing the index, you can use the CONCURRENTLY option.. Automatically drop objects that depend on the function (such as operators or triggers), and in turn all objects that depend on those objects (see Section 5.13). If columns need to be added in the middle of a large table and order is important, the best way is to drop and recreate the table. Refuse to drop the function if any objects depend on it. However, if you want to use selective delete with a where clause, TRUNCATE is not good enough.. USE WITH CARE - This will drop all rows of all tables which have a foreign key constraint on some_table and all tables … Is it expected that DROP table CASCADE drops this table and just the foreign key constraints but not the refering tables… CONCURRENTLY. CASCADE. PostgreSQL does not have logical column reordering, at least not in 9.2. However, if there are external dependencies, such as views, this is not possible without DROP CASCADE. To speed things up you can drop your constraints first, and/or TRUNCATE the table you want to drop. Even though the TRUNCATE TABLE statement removes all … (Emphasis mine.) 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.. CASCADE. However, due to viewing the foreign-key block of a table or any other table, CASCADE … I have 3 tables in the database: Product, Bill and Bill_Products which is used for referencing products in bills. Dropping your table is cascading through a constraint - Postgres is most likely bound up examining rows in that referencing table to determine what it needs to do about them. The first drop statement requires a cascade because there is a dependent little table that holds a foreign key constraint against the primary key column of the big table. Drop the big and little table if they exists. The second drop statement does not require the cascade keyword because there is not a dependent foreign key constraint. 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