tjoin: Joins multiple tables side-to-side
tjoin performs a trivial side-by-side join of multiple tables.
The N'th row of the output table consists of the N'th row of the
first input table, followed by the N'th row of the second input table, ...
and so on. It is suitable if you want to amalgamate two or more
tables whose row orderings correspond exactly to each other.
For the (more usual) case in which the rows of the tables to be joined are not already in the right order, use one of the crossmatching commands.