Add column in Oracle table

In addition,

you can add multiple columns at the same time with:

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

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

ALTER TABLE test_id ADD xml_column xmltype;

There is a syntax error- key COLUMN is not required before column name :

1. To add a single column:

ALTER TABLE TABLE_NAME ADD 
    COLUMN_NAME DATA_TYPE;

2. To add multiple columns:

ALTER TABLE TABLE_NAME ADD (
    COLUMN_NAME1 DATA_TYPE1,
    COLUMN_NAME2 DATA_TYPE2, 
    COLUMN_NAME3 DATA_TYPE3
    .
    .
    .
);

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