PLSQL中INDEX BY TABLE的 DELETE操作

开始

DELETE(n) 指代的是 删除下标为n 的元素，那么对于下标不连续的情形，会如何呢？

--INDEX BY Table

SET SERVEROUTPUT ON;



DECLARE

  TYPE enm_tab_type IS TABLE OF

       emp.ename%TYPE

       INDEX BY BINARY_INTEGER;

  

  enm_table enm_tab_type;

BEGIN

  enm_table(1):='1001';

  enm_table(2):='1002';

  enm_table(3):='1003';

  enm_table(4):='1004';

  enm_table(6):='1006';



  enm_table.DELETE(5);

  IF enm_table.EXISTS(6) THEN

     dbms_output.put_line('exists(6)');

  ELSE

     dbms_output.put_line('not exists(6)');

  END IF;

  

END;

/

运行结果：

anonymous block completed

exists(6)

结束