DROP TABLE

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4D v16

DROP TABLE



	DROP TABLE [IF EXISTS] sql_name

Beschreibung

The DROP TABLE command is used to remove the table named sql_name from a database. When the IF EXISTS constraint is passed, if the table to be removed does not exist in the database, the command does nothing and no error is generated.

This command not only removes the table structure, but also its data and any indexes, triggers and constraints that are associated with it. It cannot be used on a table that is referenced by a FOREIGN KEY constraint.

Note: You must make sure that when the DROP TABLE command is executed, there are not any records of the sql_name table that are loaded in memory in write mode. Otherwise, the error 1272 is generated.

Beispiel 1

Here is a simple example which removes the ACTOR_FANS table:

DROP TABLE ACTOR_FANS

Beispiel 2

This example does the same as the one above except that in this case, if the ACTOR_FANS table does not exist, no error is generated:

DROP TABLE IF EXISTS ACTOR_FANS

Siehe auch

ALTER TABLE
CREATE TABLE