⟩ Explian rowid, rownum?what are the psoducolumns we have?
ROWID - Hexa decimal number each and every row having unique.Used in searching.
ROWNUM - It is a integer number also unique for sorting Normally TOP N Analysys.
Other Psudo Column are
NEXTVAL,CURRVAL Of sequence are some exampls
psudo columns are default columns provided by oracle