I’ve heard people referring to this table and was not sure what it was about.
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It’s a sort of dummy table with a single record used for selecting when you’re not actually interested in the data, but instead want the results of some system function in a select statement:
e.g.
select sysdate from dual;See http://www.adp-gmbh.ch/ora/misc/dual.html
As of 23c, Oracle supports
select sysdate /* or other value */, withoutfrom dual, as has been supported in MySQL for some time already.