Create three files on the class server with the following names and contents: table1. item1 10.0 item2 15.0 table2. item1 100.0 item2 150.0 table3....

5. Create three files on the class server with the following names and contents:

table1.txt:

item1 10.0

item2 15.0

table2.txt:

item1 100.0

item2 150.0

table3.txt:

item1 1000.0

item2 1500.0

Now execute this command:

join table1.txt table2.txt | join - table3.txt

What does this operation do, and how does it work?