what is the best practice when do the CRUD for the nested object

Sometime I have to do the CRUD operation for some nested objects.

Take the "create tab开发者_如何转开发le" operation in oracle console for exmaple:

A table contains some information,name/tablespace/comment,and the most importent:

columns.

A table can have as many columns,and each column have its own attributes(name/type/length/nullable...)

So the columns are nested objects under the table. They exist along with the table.

So how to do the CRUD for the table?