Drop table oracle

Description of the illustration drop _ table. Specify the schema containing the table. Oracle Database automatically performs the following operations: All rows from the table. The Oracle DROP TABLE statement allows you to remove or delete a table from the Oracle database.

Summary: in this tutorial, you will learn how to use the Oracle DROP TABLE statement to remove an existing table. Introduction to Oracle DROP TABLE statement. To drop a table that you no longer nee use the DROP TABLE statement. The table must be contained in your schema or you must have the DROP ANY TABLE system privilege.

The SQL DROP TABLE Statement. The DROP TABLE statement is used to drop an existing table in a database. It’s called DROP because that’s the standard term for deleting objects from a database. The DELETE keyword is used when you want to delete data from a table (or materialized view ). 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. Why are you trying to drop and recreate tables at run-time? That indicates poor design.

Grant drop on specific table ? In this example we drop the BOOKS table that we created earlier in this chapter. Here are some examples of Oracle alter table syntax to drop data columns. Remember, when you drop a table column the column space remains used inside the data blocks and you may want to reorganize the table (using the dbms_redefinition package) to reclaim the free spaced from the dropped table column.

How to drop an user from Oracle? Can Oracle create a temp table? What is permission required to drop table? On tables storing millions of rows it will take a long time to run. This is an expensive operation.

And it blocks other changes to the table. So your application may be unusable while this runs! Normally, a table is moved into the recycle bin (as of Oracle 10g), if it is dropped.

However, if the purge modifier is specified as well, the table is unrecoverably (entirely) dropped from the database. The dropped table and its data remain no longer available for selection. Dropping a table drops the index and triggers associated with it. Then, when the reporting user wants to truncate said table , he can execute the procedure.

However, when you have a table with a large number of rows, using the DELETE statement to remove all data is not efficient. Oracle introduced the TRUNCATE TABLE statement that allows you to delete all rows from a big table. DROP and TRUNC do different things: TRUNCATE TABLE.

Removes all rows from a table without logging the individual row deletions.