Oracle PL/SQL - Using PRIOR and NEXT Methods

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Introduction

The following code uses a nested table with six elements to show how to use PRIOR and NEXT methods.

Demo

SQL>
SQL> DECLARE-- w w w . j a  va  2s .  c  o  m
  2    TYPE IntegerListType IS TABLE OF NUMBER;
  3    nt IntegerListType := IntegerListType(18, NULL, 36, 45, 54, 63);
  4
  5  BEGIN
  6    nt.DELETE(4);
  7    DBMS_OUTPUT.PUT_LINE('nt(4) was deleted.');
  8    FOR i IN 1..7 LOOP
  9      DBMS_OUTPUT.PUT('nt.PRIOR(' || i || ') = '); print(nt.PRIOR(i));
 10      DBMS_OUTPUT.PUT('nt.NEXT(' || i || ')  = '); print(nt.NEXT(i));
 11    END LOOP;
 12  END;
 13  /
nt(4) was deleted.
nt.PRIOR(1) = NULL
nt.NEXT(1)  = 2
nt.PRIOR(2) = 1
nt.NEXT(2)  = 3
nt.PRIOR(3) = 2
nt.NEXT(3)  = 5
nt.PRIOR(4) = 3
nt.NEXT(4)  = 5
nt.PRIOR(5) = 3
nt.NEXT(5)  = 6
nt.PRIOR(6) = 5
nt.NEXT(6)  = NULL
nt.PRIOR(7) = 6
nt.NEXT(7)  = NULL

PL/SQL procedure successfully completed.

SQL>

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