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  % Terminology follows https://en.wikipedia.org/wiki/Join_(SQL)
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  % Terminology follows https://en.wikipedia.org/wiki/Join_(SQL)
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  In SQL database terminology, the default value of \code{all = FALSE}
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  In SQL database terminology, the default value of \code{all = FALSE}
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  gives a \emph{natural join}, a special case of an \emph{inner
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  gives a \emph{natural join}, a special case of an \emph{inner
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  join}. Specifying \code{all.x = TRUE} gives a \emph{left (outer)
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  join}. Specifying \code{all.x = TRUE} gives a \emph{left (outer)
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  join}, \code{all.y = TRUE} a \emph{right (outer) join}, and both
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  join}, \code{all.y = TRUE} a \emph{right (outer) join}, and both
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  (\code{all = TRUE} a \emph{(full) outer join}.  DBMSes do not match
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  (\code{all = TRUE}) a \emph{(full) outer join}.  DBMSes do not match
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  \code{NULL} records, equivalent to \code{incomparables = NA} in \R.
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  \code{NULL} records, equivalent to \code{incomparables = NA} in \R.
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}
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}
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\note{
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\note{
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  This is intended to work with data frames with vector-like columns:
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  This is intended to work with data frames with vector-like columns: