I found this out today when doing some housekeeping. The TRUNCATE command is used to empty a table: postgres=# truncate table dummy_table; TRUNCATE TABLE 9. You should be cautious while using this command because when a table is deleted, then all the information containing in the table would also be lost permanently. 1) Drop a table that does not exist. It doesn’t modify the structure of the table. After that, you can likely DROP that table. You have to be careful while using this command because once a table is deleted then all the information available in the table would also be lost forever. Note that you need to have the roles of the superuser, schema owner, or table owner in order to drop tables. DROP TABLE query in PostgreSQL. The TRUNCATE TABLE is transaction-safe. – Sean Lange Dec 1 '14 at 21:00. you can use truncate greek_organizations, this would be faster as there is no transaction involved. It is possible that objects in other databases might still reside in the tablespace even if no objects in the current database are using the tablespace. Drop empty tables in postgres. Use the TRUNCATE TABLE statement to delete all data from a large table. A tablespace can only be dropped by its owner or a superuser. Ask Question Asked 6 years, 7 months ago. For example: DROP TABLE order_details; This DROP TABLE example would delete the table called order_details. Let’s take some examples of using the PostgreSQL DROP TABLE statement. If I do RETURN QUERY SELECT 0, 0, ''::text; in the IF block (because ct_custom_type is a composite type of (integer, integer, text), it just adds this 'empty row' to previous query result, but I don't want to return anything in this case, I can do RETURN;, but it will return that previous result and I want to discard it. – radar Dec 1 '14 at 21:01. for that table. Just Delete the rows and move on. The asterisk (*) allows you to return all columns of the deleted row from the table_name.To return specific columns, you specify them after the RETURNING keyword.. Finding empty columns of a table in PostgreSQL. DROP TABLESPACE removes a tablespace from the system. The PostgreSQL DROP TABLE statement is used to remove a table definition and all associated data, indexes, rules, triggers, and constraints for that table. If you want to change the structure of a table such as removing a column, you should use the ALTER TABLE statement. identify the process trying to rollback something which is working on this table. First, let's look at a simple DROP TABLE example that shows how to use the DROP TABLE statement to drop one table in PostgreSQL. It means that if you place it within a transaction, you can roll it back safely. If even that won't work, then restart postgresql, but most likely it will. The PostgreSQL DROP TABLE statement allows you to remove a table definition and all associated data, indexes, constraints, rules, etc. Getting information about databases If the table is empty it is barely any resources and if it isn't it is pointless to check. Note that the DELETE statement only removes data from a table. You can terminate a backend with the query SELECT pg_terminate_backend(64738), where 64738 is the pid column in your previous SELECT. Find its pid. Drop Multiple Tables. Use the up and down arrow keys to move backwards and forwards through the command history. Summary. Active 2 years, 11 months ago. PostgreSQL DROP TABLE examples. The following statement removes a table named authorin the database: [postgres=# DROP TABLE "sample_property_5" postgres=# When you do, just remember to finish it off with that semicolon: [postgres=# DROP TABLE "sample_property_5" postgres=# ; Scrolling through the command history. 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