oracle 不能是用变量来作为列名和表名 ，但使用动态sql可以；

ORACLE 不能使用变量来作为列名 和表名 一下是个人的一些验证：

 DECLARE
 ename1 emp.ename%TYPE ;
 TYPE index_emp_type IS TABLE OF VARCHAR2(100) INDEX BY PLS_INTEGER ;
 index_emp index_emp_type ;
 BEGIN
     index_emp(1) := 'e.ename';
 SELECT index_emp(1) INTO ename1 FROM emp e WHERE e.empno=7369;
 EXECUTE IMMEDIATE 'select ' || index_emp(1) || ' from emp e where e.empno=7369' into ename1  ;
 dbms_output.put_line(index_emp(1));
 dbms_output.put_line(ename1);
 END; 

 DECLARE
 x VARCHAR2(100) := 'ename';
 y VARCHAR2(100) ;
 BEGIN
     SELECT x INTO y FROM emp WHERE empno=7369;
     dbms_output.put_Line(y);
 END; 

 DECLARE
 x VARCHAR2(100) := 'ename';
 y VARCHAR2(100) ;
 BEGIN
 EXECUTE IMMEDIATE 'select ' || x || ' from emp where empno=7369' into y  ;
 dbms_output.put_line(y);
 END;

 SELECT CHR(&1+67) FROM dual ;

 SELECT &1 FROM emp ;

 CREATE TABLE  test_coloumn (
 A  NUMBER ,
 B NUMBER ,
 C  NUMBER ,
 D NUMBER ,
 E NUMBER ,
 F NUMBER
 ); 

 TRUNCATE TABLE test_coloumn ;
 SELECT * FROM test_coloumn ;
 SELECT CHR(1+67)  FROM test_coloumn WHERE a=1 ;
 SELECT D  FROM test_coloumn WHERE a=1 

 DECLARE
 X NUMBER ;
 BEGIN
 --    SELECT CHR(1+67) INTO X FROM test_coloumn WHERE a=1 ;
 --    DBMS_OUTPUT.put_line(X);
     dbms_output.put_line(CHR(1+67));
 END;