Oracle查詢內部查詢

Question

我想在oracle中創建用戶，使用我現有的表調用EMPLOYEE，我想生成一個查詢來創建用戶名和用戶。用戶名在EMPLOYEE表中。

我想創建像下面

CREATE USER (SELECT first_name FROM employee where employee_id = '1') 
IDENTIFIED BY password .....so on 

Answer 1

DBMS_UTILITY.EXEC_DDL_STATEMENT可以用來在運行PLSQL DDL語句，所以你可以試試下面的

BEGIN 
FOR c IN (select 'CREATE USER ' || first_name || ' ' || 'IDENTIFIED BY ' || 
       password_column ||' ' as rec 
      from employee where employee_id=1) LOOP 
    begin 
    dbms_utility.exec_ddl_statement(c.rec); 
    exception 
    when others then 
     dbms_output.enable; 
dbms_output.put_line ('failed for '||c.rec); 
dbms_output.put_line(sqlerrm); 
    end; 
    END LOOP; 
    END;