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. Even though the TRUNCATE TABLE statement removes all … The DROP table removes any indexes, rules, triggers, and obstacles that are present for the target table. CASCADE. PostgreSQL uses RESTRICT by default. We can put a list of tables after the DROP TABLE to remove multiple tables at once, each table separated by a comma. However, due to viewing the foreign-key block of a table or any other table, CASCADE … We can put a list of tables after the DROP TABLE to remove multiple tables at once, each table separated by a comma. CASCADE. Is it expected that DROP table CASCADE drops this table and just the foreign key constraints but not the refering tables… Hi I encountered something that puzzled me a bit. 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. This is the default. Refuse to drop the function if any objects depend on it. 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). The second drop statement does not require the cascade keyword because there is not a dependent foreign key constraint. When you are dropping a table that is referenced by another table, the object that immediately depends on the table being dropped is not the other table itself but the foreign key constraint defined on it. 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.. RESTRICTrefuses to drop table if there is any object depends on it. First, the CASCADE option is not … Drop the big and little table if they exists. RESTRICT. If you wish to remove a table and all of its descendants, one easy way is to drop the parent table with the CASCADE option. 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. 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. However, if there are external dependencies, such as views, this is not possible without DROP CASCADE. DROP CASCADE. To speed things up you can drop your constraints first, and/or TRUNCATE the table you want to drop. The DROP INDEX CONCURRENTLY has some limitations:. PostgreSQL does not have logical column reordering, at least not in 9.2. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, CASCADE must be specified. 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 … I have 3 tables in the database: Product, Bill and Bill_Products which is used for referencing products in bills. CONCURRENTLY. 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. 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. 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