|
You are correct, to a point. I had CHAR in mind,
instead of VARCHAR2. Thanks for pointing that out.
But Note:1011340.6 on Metalink does state that the the
behavior of zero-length strings and NULLS changed by
Oracle 7.1.3 all the way through Oracle 8.1.7. And if
you do some further digging, how Oracle handles
zero-length strings really only applies to inserting
the data. Try issuing the following queries (I tested
this in Oracle 8, 8i, and 9i):
SELECT * FROM my_table WHERE column_name IS NULL;
SELECT * FROM my_table WHERE column_name='';
They will return two different results! So not all
handling of zero length strings is the same. I recall
reading somewhere along the line that Oracle Corp. was
going to change this behavior in 9i. Apparently, my
information was in error. Thanks for pointing it out!
For More Information
|
