1 11/27/85  rename_relation, rnr
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 3 Syntax: rnr relation1 name1 {...relationN nameN}
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 6 Function: replaces the name of a relation with another name.
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 9 Arguments:
10 relationi
11    specifies the current name of an existing relation.
12 namei
13    specifies the new name that replaces the original name.