Add column in Oracle table

Question

I'm trying to add an XMLType column into a table, but it returns an error. Why?

This is the query:

alter table TEST_ID add column xml_column xmltype;

It returns the error:

[SQL] alter table TEST_ID add column xml_column xmltype
[Err] ORA-00904: : invalid identifier

Answer 1

You don't need the "column" word in there, so it's:

ALTER TABLE test_id ADD xml_column xmltype;

Answer 2

In addition,

you can add multiple columns at the same time with:

ALTER TABLE table_name ADD (column1 VARCHAR(40), column2 Date, column3 Number);