Join inputs share no key

An inner join keeps only rows whose key appears on both sides, and no key value appears on both, so the result would be empty. The run stops at the Join node, and the check before a run reports it too.

What to do

Compare the key columns of the two inputs. The usual causes are different spelling, case or spacing, or names on one side and identifiers on the other. Join on a pair of columns that share values, or correct the values in the source data.

Where it comes from

Shown by Join. It is one of the messages about a node.