Table nested @ schema - level how to extract the first clue?
Hello
My version of oracle database: 11g
I present to you the code here and here are the steps by which I created a table and theres a regular column to the number, but the 2nd column is a nested table.
(1) create or replace type s_def_NT_DepEmployees is table of the varchar2 (100);
2)
create the table employees_NT_test
(number of department_id
c_of_s_def_NT_DepEmployees s_def_NT_DepEmployees)
nested as NTs_c_of_s_def_NT_DepEmployees table c_of_s_def_NT_DepEmployees store
(3) now, I inserted 2 records:
insert into employees_NT_test values (1, s_def_NT_DepEmployees ('Rahul', 'Myra'));
insert into employees_NT_test values (2, s_def_NT_DepEmployees ('Rashi', 'Gaurav'));
(4) now get me this sql allows employees of department_id: 1
Select column_value
table (select c_of_s_def_NT_DepEmployees in the employees_NT_test where department_id = 1);
Output:
Rahul
Myra
Now my question: I want to just choose the first clue: IE: rahul (and not myra) and it should be compatible such that if I select the two departments I should get my output like:
Department_id | employees
1 | Rahul
2 | Rashi
PS: I am looking for a sql query, I hope I presented my question clearly, if there are doubts please let me know.
Thanks in advance
Rahul
Now my question: I want to just choose the first clue: IE: rahul(and not myra) and should be consistent
You can only do in a deterministic manner, given the current design.
Unlike PL/SQL, SQL has no way to access the items in the collection of their indices.
We can think about using ROWNUM (or ROW_NUMBER) in a subquery, but the SCOREBOARD operator and later join operations do not guarantee that the order will remain the same in the different calls.
You must redefine the collection 's_def_NT_DepEmployees' as an array of objects, and this object would include an index attribute explicitly on which you can filter.
The alternative is to create a function that takes the collection and the index for the arguments and returns the element at index - but even in this case I'm not sure that oracle could rebuild deterministically collection either.
Why use a table nested at all?
Tags: Database
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