What is Data Definition Language (DDL) in oracle ?

• Data Definition Language (DDL) statements are used to define the database structure or schema.

• The schema to perform these functions are,

CREATE:

• It is used to create tables in the database.

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CREATE TABLE [table name] ( [column definitions] ) [table parameters]

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ALTER :

• It is used to alters the structure of the database

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ALTER table tablename parameters.

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DROP :

• It is used to delete the INDEX,TABLE and DATABASES in Drop Statement.

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DROP table tablename.

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TRUNCATE :

• It is used to remove all records from a table.
• Including all spaces allocated for the records are removed.

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TRUNCATE TABLE table_name;  

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COMMENT :

• It is uses to add comments to the data dictionary

RENAME:

• It used to rename the table from old name to new name.

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RENAME TABLE old_name TO new_name;

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