Get VIEW ddl using query

Try the below query for view:

select text from ALL_VIEWS where upper(view_name) like upper(<view_name>);

For mviews:

select query from ALL_MVIEWS where upper(mview_name) like upper(<mview_name>);

For materialized views use:

select dbms_metadata.get_ddl('MATERIALIZED_VIEW','MView_name','Schema_Name') 
  from dual;

See all supported object types here: DBMS_METADATA: Object Types

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