SQL - 什麼是錯的這個程序執行

Question

CREATE OR REPLACE procedure verify_employee 
(emp_license IN trkdriver.L#%TYPE) 
IS 
result VARCHAR2(10); 

BEGIN 
select e# INTO result 
from trkdriver where l#='emp_license'; 
END; 
/

以上是我的程序

SQL> desc trkdriver; 
Name          Null? Type 
----------------------------------------- -------- ---------------------------- 

E#          NOT NULL NUMBER(12) 
L#          NOT NULL NUMBER(8) 
STATUS         NOT NULL VARCHAR2(10) 

我試圖

SQL> execute verify_employee('10001'); 
BEGIN verify_employee('10001'); END; 

* 
ERROR at line 1: 
ORA-01722: invalid number 
ORA-06512: at "USER1.VERIFY_EMPLOYEE", line 7 
ORA-06512: at line 1 

我做了什麼錯，我只是想嘗試一個簡單的程序它將根據我輸入的員工許可證ID選擇

Answer 1

l#是數字，並且您將它與字符串進行比較： ... where l#='emp_license';

Answer 2

你必須如下刪除''：

CREATE OR REPLACE procedure verify_employee 
(emp_license IN trkdriver.L#%TYPE) 
IS 
result VARCHAR2(10); 

BEGIN 
select e# INTO result 
from trkdriver where l#=emp_license; 
END; 
/

結束運行：

execute verify_employee(10001);