clearparams
Usage:
clearparams <pname> ...
Clears the value of one or more named parameters.
Each of the <pname> values supplied may be
either a parameter name or a simple wildcard expression
matching parameter names. Currently the only wildcarding
is a "*" to match any sequence of characters.
clearparams * will clear all the parameters
in the table.
It is not an error to supply <pname>s
which do not exist in the table - these have no effect.