Odd sysdate construction

select SYSDATE@! from dual;
This appeared in a client query (actually it was trunc(sysdate@!) )
What is the @!?   Its valid in the Oracle takes it but I can't find any =
documentation as to what it is. It seems to act the same as plain old =
sysdate. But it's the only place where @! Is allowed.

Don Freeman
Database Administrator 1
Pennsylvania Dept of Health
Bureau of Information Technology


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