如何在Oracle中使用字符串选择表?

说真的,这样的数据模型是一个错误 . 如果你想分开几个月 分别地

无论如何,这里有一个方法:

示例表和返回refcursor的函数:

SQL> create table test_201812 as select * From dept;

Table created.

SQL> create table test_date (id number, datum number);

Table created.

SQL> insert into test_date values (1, 201812);

1 row created.

SQL> create or replace function f_test (par_id in test_date.id%type)
  2    return sys_refcursor
  3  is
  4    l_datum test_date.datum%type;
  5    l_str   varchar2(200);
  6    l_rc    sys_refcursor;
  7  begin
  8    select datum
  9      into l_datum
 10      from test_date
 11      where id = par_id;
 12
 13    l_str := 'select * from test_' || l_datum;
 14    open l_rc for l_str;
 15    return l_rc;
 16  end;
 17  /

Function created.

测试:

SQL> select f_test(1) from dual;

F_TEST(1)
--------------------
CURSOR STATEMENT : 1

CURSOR STATEMENT : 1

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON


SQL>