Oracle PLSQL 将数字数据类型的多行/列值提取到数字类型的集合中？

Question

We have a table that was designed to have multiple columns with number data types that stores a primary key from another table. Each row has a unique organization id. So the structure looks like this.

create table matrix_table (
    id number primary key
  , emp_id1 number
  , emp_id2 number
  , emp_id3 number
  , emp_id4 number
)
/
insert into matrix_table values ( 1, 100, 101, 102, 103 )
/
insert into matrix_table values ( 2, 200, 201, 202, 203 )
/
insert into matrix_table values ( 3, 300, 301, 302, 303 )
/
insert into matrix_table values ( 4, 400, 401, 402, 403 )
/

create type emp_ids is table of number
/

Then I try to do it like this but it doesn't work since it is expecting a collection of emp_ids

declare
  l_emp_ids emp_ids := emp_ids();
begin
select emp_ids(emp_id1, emp_id2, emp_id3, emp_id4)
  bulk collect
  into l_emp_ids
  from matrix_table;
end;

ORA-06550: line 4, column 12: PL/SQL: ORA-00932: inconsistent datatypes: expected NUMBER got APPS.EMP_IDS
ORA-06550: line 4, column 5: PL/SQL: SQL Statement ignored

I also tried without the bulk collect but again it won't work since it is expecting only 1 record whereas I have 4.

declare
  l_emp_ids emp_ids := emp_ids();
begin
select emp_ids(emp_id1, emp_id2, emp_id3, emp_id4)
  into l_emp_ids
  from matrix_table;
end;

ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at line 4

I know this can via union or thru loop but I was wondering if there is a simpler way to do it.

Reason I'm doing this is because later on I need to join this with another table. Kind of like this.

select e.*
  from employees e
     , table ( emp_ids_var ) v
 where e.emp_id = v.column_value

For reference, here's our database details:

Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
PL/SQL Release 12.1.0.2.0 - Production                                      
CORE    12.1.0.2.0  Production                                                  
TNS for Linux: Version 12.1.0.2.0 - Production                              
NLSRTL Version 12.1.0.2.0 - Production   

                               

Appreciate any feedback.

Answer 1

As far as I know, we need to create an object type first.

create type obj_ids is object (
 emp_id1 number
  , emp_id2 number
  , emp_id3 number
  , emp_id4 number
);
create type emp_ids is table of obj_ids;

And this should work:

declare
  l_emp_ids emp_ids := emp_ids();
begin
select obj_ids(emp_id1, emp_id2, emp_id3, emp_id4)
  bulk collect
  into l_emp_ids
  from matrix_table;
  
for i in 1..l_emp_ids.count
loop
dbms_output.put_line (l_emp_ids(i).emp_id1);
end loop;
end;