哪个语句将成功调用该函数？ [关闭]

Posted 2023-03-28

【中文标题】哪个语句将成功调用该函数？ [关闭]

【英文标题】：Which statement will successfully invoke the function? [closed]

【发布时间】：2013-03-26 11:49:48

【问题描述】：

         create or replace function calc_player_avg
            (v_id IN player_bat_stat.player_id%type)
         return number 
         is
         v_avg number;
         begin
             select hits / at_bats
             into v_avg
             from player_bat_stat
             where player_id = v_id;
             return (v_avg);
         end;

调用包括“执行”语句，但这里以下语句被标记为错误：

         Execute calc_player_avg(31);

正确的是：

         select calc_palyer_avg(player_id) from player_bat_stat;

【参考方案1】：

第一个是错误的，因为对象是一个函数，所以你需要一个变量来捕获返回。

SQL> execute calc_player_avg(31);
BEGIN calc_player_avg(31); END;

      *
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00221: 'CALC_PLAYER_AVG' is not a procedure or is undefined
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored


SQL> var avg number;
SQL> execute :avg := calc_player_avg(31);

PL/SQL procedure successfully completed.
SQL> print avg

       AVG
----------
        .4

【讨论】：

哦，是的！函数需要返回值。我怎么能忘记这么重要的事实。谢谢:)