PLSQL中INDEX BY TABLE 的 prior 和 next 操作学习

开始

--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';

  

  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;

/

运行结果：

anonymous block completed

NEXT(3) is:4

NEXT(4) is:6

PRIOR(6) is:4

也就是说 index 可以下标不连续。

结束