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Is it possible to modify column datatype with existing data in oracle? Is it possible using alter table modify column? Here are the 4 steps.

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ALTER TABLE MODIFY column helps to change column datatype to another datatype, set default values, add NULL checks, change scale or size etc

OracleTutorial.Net brings you a cool easy to understand Oracle tutorial posts. Here is a post on how to modify the following things of an existing column of any existing table in Oracle database.

Datatype

Scale or Size

Visibility

Set default value

Add NULL or NOT NULL check

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