Best practice - comparing NUMBER(4, 0) and VARCHAR2(5)

I have two fields in two different views that I am comparing in a complex query. This is just one small part of the query.
I want to make sure I am doing this the best way. First, here are the two fields:
ZAS.ORG_ID NUMBER(4,0)
ORG.IORG_NBR VARCHAR2(5)
And here is the part of the query that I select the first field.
(CASE WHEN ZAS.ORG_ID IS NULL THEN NULL ELSE (TO_CHAR(ZAS.ORG_ID, '0000')) END)
As you can see, I do the same thing in the second part of the query. To help you understand, note that I am basically pulling back a bunch of data from two sources and comparing them.
(CASE WHEN org.iorg_nbr IS NULL THEN NULL ELSE (TO_CHAR(org.iorg_nbr, '0000')) END)
Please let me know if I need to supply any additional information. Any help would be greatly appreciated. Thanks!

Hello,
This:
(CASE WHEN ZAS.ORG_ID IS NULL THEN NULL ELSE (TO_CHAR(ZAS.ORG_ID, '0000')) END)Could simply be this:
(TO_CHAR(ZAS.ORG_ID))And this:
(CASE WHEN org.iorg_nbr IS NULL THEN NULL ELSE (TO_CHAR(org.iorg_nbr, '0000')) END)Can simply be this:
(org.iorg_nbr)No need to do anything with that, since it's already TRIMmed (no spaces), and you're converting ZAS.ORG_ID to a CHAR string, so they both will match without the extra '0's. And no need to explicitly handle NULLs at all.

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Best practice - comparing NUMBER(4, 0) and VARCHAR2(5)

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