CODEWITHSUNDEEP
sqloracle-database
iminiki
iminiki

Reputation: 2573

How to select a table using a string in Oracle?

First of all, I know the question is vague, so feel free to edit it if you can describe it better. There are some sets of table like TEST_201812, TEST_201901, etc. . I have another table that stores these values:

TEST_DATE:

ID   DATE
1    201810
2    201811
3    201812
4    201901

Now what I want is to select the tables mentioned above (e.g.TEST_201812) by using TEST_DATE. I know it's wrong, but something like this:

select * from TEST_(select DATE from TEST_DATE where ID = 1)

Does anyone know how to achieve this?

Upvotes: 2

Views: 4542

Answers (1)

Littlefoot
Littlefoot

Reputation: 142705

Seriously, such a data model is a disaster. If you want to keep separate months separately, use one - partitioned - table.

Anyway, here's one option of how to do that:

Sample tables and a function that returns refcursor:

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.

Testing:

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>

Upvotes: 5

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