Interface MergeOptions

Keep the rows of both frames that have no match. Default false.

Keep the rows of x that have no match in y (y's columns missing). Default all.

Keep the rows of y that have no match in x (x's columns missing). Default all.

The key columns, in both frames. Default: the column names common to both, in x's order.

The key columns of x. Default by.

The key columns of y (as many as byX, matched in order). Default by.

Order the rows by the key. Default true.

Appended to the names of the non-key columns that occur in both frames. Default [".x", ".y"].