The following files containing:
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?
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