Insert into column from same table in Oracle

In many case we are suppose to add one additonal column in our table and insert data from another column from same table.

In my case, I want to add month column which store only month and year in yyyymm format

ALTER TABLE ebiz1
ADD mont column_type NULL

From the above syntax we will get additonal column in my table ebiz1. After the column is created I need to use UPDATE Statement as below.

UPDATE ebiz1 SET
mont= to_number(to_char(gl_date, 'yyyymm'))

From the Above statement I just copy gl_date column data into month column in yyyymm format

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