CAN I PASS A TABLE NAME AS A VARIABLE IN THE FROM CLAUSE?

For some reason, I am trying to use a variable name containing the actual table name in the from clause and it won't allow me. I keep getting the error saying I need to declare the variable I'm using eventhough I've used it in another statement that is not the FROM clause.
Example
SELECT count(col1), sum(col2)
FROM v_table_name;
v_table_name was declared as:
v_tablename VARCHAR2(20);
v_tablename := real_table_name;
Is it not allowed to use variables in the FROM clause or am I missing something here?

You can use the Forms "From Clause Query" as the datasource for the data block. Then you can change the QUERY_DATA_SOURCE_NAME using set_block_property, so you can use any SQL statement you like. Of course you must name/alias the columns in a consistent manner so that the number of database items on the block matches those being queried.

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v_itname = <it_2>.
now read using variable
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and
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Hi ,
This can be done. Please refer to the codes below. Please note that the code will work if the itabs are of type standard table else it may dump.
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DATA: v_table1(10) TYPE c VALUE 'I_MARA',
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FIELD-SYMBOLS : <fs_tab>   TYPE STANDARD TABLE,
                <fs_field> TYPE ANY.
DATA: otab TYPE abap_sortorder_tab,
oline TYPE abap_sortorder.
SELECT * UP TO 10 ROWS
FROM mara
INTO TABLE i_mara.
IF sy-subrc = 0.
ASSIGN (v_table1) TO <fs_tab>.
IF sy-subrc = 0.
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ENDIF.
ENDIF.
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Dev.

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I am having the result stored in the variable expression . I just need a way to be able to use it as the Destination table in ADO .net Destination.
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Hi Adeep,
Based on my further research, just as hsbal said, we can set a variable as ADO.NET Destination table via Expressions property in Data Flow Task.
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Katherine Xiong
TechNet Community Support

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CURSOR crs_validate IS
select * FROM <ACT_JUN_2006_LOB>;
this ACT_JUN_2006_LOB table name, I should able to pass it when I open the cursor ... any help appreciated. thanks.
srini

Thanks all for the response. REFCURSOR does work: here is an example ... which I found on-line
procedure emp_test(
month varchar2,
year varchar2)
is
type cur_typ is ref cursor;
c cur_typ;
query_str varchar2(200);
emp_number number := 7900;
salary number;
name varchar2(30);
Begin
query_str := 'Select empno, ename, sal from emp_' || month ||'_'||year
|| ' where empno = :id';
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loop
fetch c into emp_number, name, salary;
exit when c%notfound;
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close c;
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is it possible to create a view from a from a table like this
create view my_view as select id, col1, col2, result from <<my_latest_cacahe_table>>;
the table in the from clause changes the name .
I have another table which indicates the the latest name of my cache tables. Always there are two records there. The latest one and previous one.
select * from cache_table_def
table_name cache_table_name refresh_date
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my_table cache_table235 1/22/2012
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I've worked up an example that does what you ask. It uses the SCOTT schema EMP table. Make two copies of the EMP table, EMP1 and EMP2. I deleted dept 20 from emp1 and deleted dept 30 from emp2 so I could see that the result set really came from a different table.
-- create a context to hold an environment variable - this will be the table name we want the view to query from
create or replace context VIEW_CTX using SET_VIEW_FLAG;
-- create the procedure specified for the context
- we will pass in the name of the table to query from
create or replace procedure SET_VIEW_FLAG ( p_table_name in varchar2 default 'EMP')
as
begin
dbms_session.set_context( 'VIEW_CTX', 'TABLE_NAME', upper(p_table_name));
end;
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select * from emp where 'EMP' = sys_context( 'VIEW_CTX', 'TABLE_NAME' );
select * from emp1 where 'EMP1' = sys_context( 'VIEW_CTX', 'TABLE_NAME' );
select * from emp2 where 'EMP2' = sys_context( 'VIEW_CTX', 'TABLE_NAME' )
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exec set_view_flag( p_table_name => 'EMP' );
exec set_view_flag( p_table_name => 'EMP1' );
exec set_view_flag( p_table_name => 'EMP2');
-- this will show you the current value of the context variable
SELECT sys_context( 'VIEW_CTX', 'TABLE_NAME' ) FROM DUAL
-- this is the view definition - it does a UNION ALL of the three queries but only one will actually return data
CREATE VIEW THREE_TABLE_EMP_VIEW AS
select * from emp where 'EMP' = sys_context( 'VIEW_CTX', 'TABLE_NAME' )
union all
select * from emp1 where 'EMP1' = sys_context( 'VIEW_CTX', 'TABLE_NAME' )
union all
select * from emp2 where 'EMP2' = sys_context( 'VIEW_CTX', 'TABLE_NAME' )
-- first time - no data since context variable hasn't been set yet
SELECT * FROM THREE_TABLE_EMP_VIEW
-- get data from the EMP table
exec set_view_flag( p_table_name => 'EMP' );
SELECT * FROM THREE_TABLE_EMP_VIEW
-- get data from the EMP2 table
exec set_view_flag( p_table_name => 'EMP2');
SELECT * FROM THREE_TABLE_EMP_VIEW
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For reporting it works great!

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db2.insert("CREATE TABLE "+resNr+"(\n"+
"ID int(11) NOT NULL auto_increment,\n"+
"GAESTNR int(11) NOT NULL default '0',\n"+
"VARENR int(11) NOT NULL default '0',\n"+
"ANTAL int(11) NOT NULL default '0',\n"+
"VAREBETEGNELSE tinytext NOT NULL,\n"+
"PRIS int(11) NOT NULL default '0',\n"+
"BEL�B int(11) NOT NULL default '0',\n"+
"PRIMARY KEY (ID)\n"+
")TYPE=MyISAM");

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I want to use a dynamic schema name in the from clause but its not working.

DECLARE
     vblQueryName VARCHAR2(20);
     vblSchemaName VARCHAR2(20);
BEGIN
     SELECT CurrentSchemaName INTO vblSchemaName FROM HR_989_SCHEMA;
     vblQueryName:='060_525_020';
     INSERT /*+ APPEND(HP_ELIGIBILITIES,4) */ INTO HP_ELIGIBILITIES
          LVL1ID,
          LVL1Desc,
          LVL2ID,
          LVL2Desc,
          LVL3ID,
          LVL3Desc,
          LVL4ID,
          LVL4Desc
     SELECT /*+ PARALLEL(a,4) */
          LVL1ID,
          LVL1Desc,
          LVL2ID,
          LVL2Desc,
          LVL3ID,
          LVL3Desc,
          LVL4ID,
          LVL4Desc
     FROM
     bold     vblSchemaName.HP_ELIGIBILITIES a
     WHERE
          UPPER(LVL2ID) = 'XX' ;
     COMMIT;
DBMS_OUTPUT.PUT_LINE( 'Query Executed: ' || vblqueryName);
INSERT INTO HP_QUERYEXECLOG(QueryName) VALUES(vblQueryName);
EXCEPTION WHEN NO_DATA_FOUND THEN NULL;
END;
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I want to use a dynamic schema name in the from clauseyou can alternatively set the current schema as e.g. in:
declare
   vblqueryname    varchar2 (20);
   vblschemaname   varchar2 (20);
begin
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   vblqueryname := '060_525_020';
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         into hp_eligibilities (lvl1id,
                                lvl1desc,
                                lvl2id,
                                lvl2desc,
                                lvl3id,
                                lvl3desc,
                                lvl4id,
                                lvl4desc
      select /*+ PARALLEL(a,4) */
            lvl1id,
             lvl1desc,
             lvl2id,
             lvl2desc,
             lvl3id,
             lvl3desc,
             lvl4id,
             lvl4desc
        from hp_eligibilities a
       where upper (lvl2id) = 'XX';
   commit;
   dbms_output.put_line ('Query Executed: ' || vblqueryname);
   insert into hp_queryexeclog (queryname)
   values (vblqueryname);
exception
   when no_data_found
   then
      null;
end;

CAN I PASS A TABLE NAME AS A VARIABLE IN THE FROM CLAUSE?

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