Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Can I use a parameter in SELECT FROM as table name?

Posted on 2006-07-20
8
Medium Priority
?
2,111 Views
Last Modified: 2012-06-21
I am making a common functuion, one parameter is a array table name, I need to select some columns from that table. Can I use as below?

Select *
FROM param1
0
Comment
Question by:mikezang
8 Comments
 
LVL 14

Expert Comment

by:sathyagiri
ID: 17151376
You can use dynamic query to do that

Example

qry_string := 'select * from ' || param1;
execute immediate qry_string into var;
0
 
LVL 16

Expert Comment

by:MohanKNair
ID: 17151814
If the function rsturns the colelction object then it can be used in select statements

select * from TABLE(<function name>);
0
 
LVL 5

Author Comment

by:mikezang
ID: 17152351
Can you explain more detail or give a smaple?
0
Get your Disaster Recovery as a Service basics

Disaster Recovery as a Service is one go-to solution that revolutionizes DR planning. Implementing DRaaS could be an efficient process, easily accessible to non-DR experts. Learn about monitoring, testing, executing failovers and failbacks to ensure a "healthy" DR environment.

 
LVL 16

Accepted Solution

by:
MohanKNair earned 100 total points
ID: 17152407
The below link queries a function which returns a collection object.

http://www.oracle-base.com/dba/miscellaneous/get_pivot.sql
0
 
LVL 3

Assisted Solution

by:hardikbeit
hardikbeit earned 100 total points
ID: 17152410
Hi,

'Execute immediate' allows to execute a dynamic SQL statement. This statement is a string. bind-var-n cannot be the literal null. Use a dummy variable instead whose value is null.

One Example is:
create or replace function count_in_table
  (attr in varchar2, attrval in varchar2, tbl in varchar2)
  return number
is
  cnt number;
begin
  execute immediate 'select count(1) from ' || tbl || ' where ' || attr || ' = :a' into cnt using attrval;
  return cnt;
end;

In this command attr: which column you want to filter and attrval: column value for filtering process.

Let me know in case of any query.

With regards, Hardik
0
 
LVL 3

Expert Comment

by:hardikbeit
ID: 17152433
Hi,

For more details related EXECUTE IMMIDIATE or Dynamic SQL:
http://www.utexas.edu/its/unix/reference/oracledocs/v92/B10501_01/appdev.920/a96624/11_dynam.htm

With regards, Hardik
0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This post first appeared at Oracleinaction  (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself). I  will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…
Shell script to create broker configuration file using current broker Configuration, solely for purpose of backup on Linux. Script may need to be modified depending on OS-installation. Please deploy and verify the script in a test environment.
Via a live example show how to connect to RMAN, make basic configuration settings changes and then take a backup of a demo database
This video shows how to Export data from an Oracle database using the Original Export Utility.  The corresponding Import utility, which works the same way is referenced, but not demonstrated.
Suggested Courses

916 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question