Oracle drop table

What is DROP TABLE command? How do you drop a table in SQL? When you drop a range-, hash-, or list-partitioned table , then the database drops all the table partitions.

If you drop a composite-partitioned table , then all the partitions and subpartitions are also dropped. When you drop a partitioned table with the PURGE keywor the statement executes as a series of subtransactions, each of which drops a. To drop a table that you no longer nee use the DROP TABLE statement. In this example we drop the BOOKS table that we created earlier in this chapter. All indexes and triggers on the table are dropped. The table is no longer in the data dictionary.

You can perform DDL operations (such as ALTER TABLE , DROP TABLE , CREATE INDEX) on a temporary table only when no session is bound to it. The dropped table and its data remain no longer available for selection. Dropping a table drops the index and triggers associated with it. However, if the purge modifier is specified as well, the table is unrecoverably (entirely) dropped from the database. This is an expensive operation.

On tables storing millions of rows it will take a long time to run. And it blocks other changes to the table. So your application may be unusable while this runs! DROP TABLE cannot be used to drop a table that is referenced by a FOREIGN KEY constraint. The referencing FOREIGN KEY constraint or the referencing table must first be dropped.

If both the referencing table and the table that holds the primary key are being dropped in the same DROP TABLE statement, the referencing table must be listed first. A user dropping his own table does not need or use the DROP ANY TABLE privilege, and so would not be audited by this. AUDIT DROP TABLE owner. We have drop any table privilege in oracle database granting which would be very dangerous and the user can drop any table in the database.

Find Great Deals Now! Buy Top Products On eBay. Money Back Guarantee! I would make sure you are 1 sure in the selections first however. The process of dropping a column from a big table can be time and resource consuming.

You should be aware that by querying ALL_OBJECTS you might find an object that is neither a table nor in your own schema. If you only want to query for tables in your own schema then use USER_ TABLES. Also, if TABLE _LOCK is DISABLED or DROPPED is YES then the drop will fail. To drop a column from a table you can use one of these syntax examples, depending on whether you wish to drop a single column (with drop column) or multiple columns. Prior to this it was necessary to drop the entire table and rebuild it.

Now you can mark a column as unused (logical delete) or delete it completely (physical delete). Oracle alter table drop column.