Oracle ALTER TABLE MODIFY Column :Modify the column’s visibility and Allow or not Allow NULL values

Oracle ALTER TABLE MODIFY Column Summary: in this tutorial, you will learn how to use the Oracle ALTER TABLE MODIFY column statement to change the definition of existing columns. To change the definition of a column in a table, you use the ALTER TABLE MODIFY column syntax as follows: ALTER TABLE table_name MODIFY column_name action; Code language: SQL (Structured Query Language) (sql) The statement is straightforward. To modify a column of a table, you need to specify the column name, table name, and action that you want to perform. Oracle allows you to perform many actions but the following are the main ones: Modify the column’s visibility Allow or not allow null values Shorten or widen the size of the column Change the default value of a column Modify the expression of the virtual columns