PLSQL - IN clause using variable with multiple values - sql

Question

I am looping a statement and extracting the IDs and putting it into a variable:
declare
l_id NUMBER;
BEGIN
FOR i IN 1..l_row_count
loop
l_id := to_number(apex_json.get_varchar2(p_path => 'rows[%d].id',
p0 => i, p_values => l_values
)
);
end loop:
I am trying to get all the ids and then run a select statement where this list of IDs will be used inside of a where statement. So the full code would look like this:
declare
l_id NUMBER;
l_id_list [SOME_TYPE_NOT_SURE];
BEGIN
FOR i IN 1..l_row_count
loop
l_id := to_number(apex_json.get_varchar2(p_path => 'rows[%d].id',
p0 => i, p_values => l_values
)
);
//somehow add l_id to the l_id_list
end loop:
SELECT * FROM mytable WHERE someid IN (l_id_list);
END;
I haven't been able to get it to work. I am not an expert in PLSQL, but I tried using arrays or trying to concat the l_id_list as a string, but I am unable to get it work. Basically all I am trying to do is create a list of all the IDs, then run a select statement to see if these IDs exist in this other table.

Answer 1

Declare the type globally:
CREATE TYPE number_list IS TABLE OF NUMBER;
Then you can initialise the list and then, in each iteration of the loop, EXTEND the list and assign the value and, finally, use the MEMBER OF operator or IN with a subquery and table collection expression:
DECLARE
l_id_list NUMBER_LIST := NUMBER_LIST();
BEGIN
FOR i IN 1..l_row_count
LOOP
l_id_list.EXTEND;
l_id_list(l_id_list.COUNT) := to_number(
apex_json.get_varchar2(
p_path => 'rows[%d].id',
p0 => i,
p_values => l_values
)
);
END LOOP;
SELECT *
-- BULK COLLECT INTO ...
FROM mytable
WHERE someid MEMBER OF l_id_list;
-- or
SELECT *
-- BULK COLLECT INTO ...
FROM mytable
WHERE someid IN (SELECT COLUMN_VALUE FROM TABLE(l_id_list));
END;

Answer 2

In your case l_id_list's type must be declared globally and as collection-type. Locally defined types cannot be used as collections, so cannot be used inside in-clause.
declare
l_id NUMBER;
l_id_list [SOME_GLOBAL_COLLECTION_TYPE];
BEGIN
FOR i IN 1..l_row_count
loop
l_id := to_number(apex_json.get_varchar2(p_path => 'rows[%d].id',
p0 => i, p_values => l_values
)
);
//somehow add l_id to the l_id_list
end loop:
SELECT * FROM mytable WHERE someid IN (select * from table(l_id_list));
END;