What if GRANTS statement are executed twice?

What happens if GRANTS statments are executed twice?
Will there be any error thrown at the time of second execution?
And will we need to revert twice in case we need to remove the GRANTS?
Does it matter which user can give GRANTS if the user has the ccess to pass on the GRANTS for a particular object?
thanks,
tik

To add to what Sybrand said, as long as the username that runs the grant script has the necessary privilege then who issues the grants does not matter. However you cannot directly grant privileges for another users object to yourself even if you can grant them to another user so if the username who ran the script was intended to receive some of the grants then you definitely need to rerun the script.
Rerunning the script as the intended user would not hurt anything. Only one revoke would be necessary to remove any granted privilege and it can be issued by any user with the privilege necessary to perform the revoke such as the object owner or a DBA.
HTH -- Mark D Powlel --

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Message was edited by:
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