--INDEX BY Table
SET SERVEROUTPUT ON;DECLARETYPE enm_tab_type IS TABLE OFemp.ename%TYPEINDEX BY BINARY_INTEGER;enm_table enm_tab_type;
BEGINenm_table(1):='1001';enm_table(2):='1002';enm_table(3):='1003';enm_table(4):='1004';enm_table(6):='1006';dbms_output.put_line( 'NEXT(3) is:' ||enm_table.NEXT(3));dbms_output.put_line( 'NEXT(4) is:' ||enm_table.NEXT(4));dbms_output.put_line( 'PRIOR(6) is:' ||enm_table.PRIOR(6));END;
/

anonymous block completed
NEXT(3) is:4
NEXT(4) is:6
PRIOR(6) is:4