With t as (select ...) = where to find in documentation?

Hi there,
I recently found a sql command:
With t as (select '' x from dual)
select count(*) from t where ('' is null and x is null) or (x='');
Where can I find something in the documentation. I already took a look at the sql reference and at Google but without any help.
I am interested in using the query 2 times (very similar) but only executing it once. I think that this should work ..
Thanks,
Michael

You're a bit vaue I'm afraid. "Where can I find something in the documentation"?
Perhaps one of the links below helps.
WITH query_name
NULL and zero length string

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With t as (select ...) = where to find in documentation?

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