Parameter for IN query oracle [duplicate] - oracle

Question

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Oracle: Dynamic query with IN clause using cursor
(1 answer)
Closed 8 years ago.
SELECT * FROM EMPLOYEE
WHERE EMP_NAME IN (:EMP_NAME);
This is my query and now the EMP_NAME parameter I would like to send it as a list of strings.
When I run this query in SQL developer it is asked to send the EMP_NAME as a parameter, Now I want to send 'Kiran','Joshi' (Basically, I want to fetch the details of the employee with employee name either Kiran or Joshi. How should I pass the value during the execution of the query?
It works when I use the value Kiran alone, but when I concatenate with any other string it won't work. Any pointers in this?
I tried the one below
'Kiran','Joshi'
The above way doesn't work as understood this is a single parameter it tries the employee with the name as 'Kiran',Joshi' which won't come. Understandable, but in order to achieve this thing, how can I go ahead?
Any help would be really appreciated.

Answer 1

Thanks to the people who helped me in solving this problem.
I could get the solution using the way proposed, below is the approach
SELECT * FROM EMPLOYEE WHERE EMP_NAME IN (&EMP_NAME)
I have tried in this way and following are the scenarios which I have tested and they are working fine.
Scenario 1:
To fetch details of only "Kiran", then in this case the value of EMP_NAME when sql developer prompts is given as Kiran. It worked.
Scenario 2:
To fetch details of either "Kiran" or "Joshi", then the value of EMP_NAME is sent as
Kiran','Joshi
It worked in this case also.
Thanks Kedarnath for helping me in achieving the solution :)

Answer 2

IN clause would be implicitly converted into multiple OR conditions.. and the limit is 1000.. Also query with bind variable means, the execution plan will be reused.. Supporting bind variables for IN clause will hence affect the bind variable's basic usage, and hence oracle limits it at syntax level itself.
Only way is like name in (:1,:2) and bind the other values..
for this, you might dynamic SQL constructing the in clause bind variables in a loop.
Other way is, calling a procedure or function(pl/sql)
DECLARE
v_mystring VARCHAR(50);
v_my_ref_cursor sys_refcursor;
in_string varchar2='''Kiran'',''Joshi''';
id2 varchar2(10):='123'; --- if some other value you have to compare
myrecord tablename%rowtype;
BEGIN
v_mystring := 'SELECT a.*... from tablename a where name= :id2 and
id in('||in_string||')';
OPEN v_my_ref_cursor FOR v_mystring USING id2;
LOOP
FETCH v_my_ref_cursor INTO myrecord;
EXIT WHEN v_my_ref_cursor%NOTFOUND;
..
-- your processing
END LOOP;
CLOSE v_my_ref_cursor;
END;
IN clause supports maximum of 1000 items. You can always use a table to join instead. That table might be a Global Temporary Table(GTT) whose data is visible to thats particular session.
Still you can use a nested table also for it(like PL/SQL table)
TABLE() will convert a PL/Sql table as a SQL understandable table object(an object actually)
A simple example of it below.
CREATE TYPE pr AS OBJECT
(pr NUMBER);
/
CREATE TYPE prList AS TABLE OF pr;
/
declare
myPrList prList := prList ();
cursor lc is
select *
from (select a.*
from yourtable a
TABLE(CAST(myPrList as prList)) my_list
where
a.pr = my_list.pr
order by a.pr desc) ;
rec lc%ROWTYPE;
BEGIN
/*Populate the Nested Table, with whatever collection you have */
myPrList := prList ( pr(91),
pr(80));
/*
Sample code: for populating from your TABLE OF NUMBER type
FOR I IN 1..your_input_array.COUNT
LOOP
myPrList.EXTEND;
myPrList(I) := pr(your_input_array(I));
END LOOP;
*/
open lc;
loop
FETCH lc into rec;
exit when lc%NOTFOUND; -- Your Exit WHEN condition should be checked afte FETCH iyself!
dbms_output.put_line(rec.pr);
end loop;
close lc;
END;
/