以Table_name作为输入的函数，并在Oracle中返回一个数字

Question

I have a function that takes table_name as input and returns a number. The function gets compiled properly but for some reason when I try test the function it throws error - missing keyword.

CREATE OR replace FUNCTION TEST_FUNCTION (name_table IN VARCHAR2) RETURN NUMBER

        IS         

          rday NUMBER;                
  BEGIN 

  execute immediate 
  'select day_i into rday
                FROM ' || name_table || '
                WHERE day_i = 1 and rownum = 1';

   return rday;

  END TEST_FUNCTION;

This is how I am testing it Select TEST_FUNCTION ('FDR_REP') from dual;

Answer 1

The syntax for execute immediate is different for an into clause try

CREATE OR replace FUNCTION TEST_FUNCTION (name_table IN VARCHAR2) RETURN NUMBER

        IS         

          rday NUMBER;                
  BEGIN 
   execute immediate  'select day_i 
                FROM ' || name_table || '
                WHERE day_i = 1 and rownum = 1' into rday;


   return rday;

  END TEST_FUNCTION;