Is there a way to enter a list of expressions in one variable?

I have a query like this:

SQL > select distinct t1.name of people join t1 t2 on t1.id = t2.people_id join who_likes_what leisure t3 on t3.id = t2.hobbies_id and t3.text ("music", "horses") Group of t1.name having count (t3.text) = 2;

NAME

--------------------

Bob

Amy

(2 is the number of elements in ('music', 'Horses'))

1. is there a way to set the list of expression in a single variable?

"Having my brain turns off I had thought that if I created a (unique) string variable that contains the value '('Musique', 'Chevaux') ' I would be done.

I understand why it may not work, but I don't know how to replace it with a single variable.

I may not want to use (: var_1,: var_2,: var_n) because the number of items in the list expression is variable, and I use a prepared statement SQL.

In the other thread, I've already been advised to use a single as string "music ~ horses and the following construction:"

Select regexp_substr(:set_1 ||) (' ~ ',' [^ ~] +', 1, level) double txt

but is there a way to do this directly?

2. is there a function that returns the number of items in a list of expression?

(to get 2 for 1 entry).

Thanks for any suggestions.

[Update: new tests, it seems that the PL/SQL function is not necessary!] I could link a collection directly to SQL, at least in 12 c. See my post below with details].

Here is a simple example of a PL/SQL function that receives a collection, it uses SQL and passes the result to the caller.

First of all, I'll use a collection type that is already defined: SYS.dbms_debug_vc2coll, which is defined as follows:

create or replace TYPE dbms_debug_vc2coll is table of varchar2(1000)

Now, here's a function that takes as input a collection of that type, and returns a REF CURSOR over the result set.

create or replace function get_rset (
  p_inset in SYS.dbms_debug_vc2coll
)
return sys_refcursor is
  l_refcur sys_refcursor;
begin
  open l_refcur for select * from table(p_inset);
  return l_refcur;
end get_rset;
/

We can test this function in SQL * longer or Oracle SQL Developer:

var v_refcur refcursor;

exec :v_refcur := get_rset(SYS.dbms_debug_vc2coll('Music', 'Horses'));
print :v_refcur;

COLUMN_VALUE

------------

Music

Horses

Tags: Database

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