I have these two tables which contain three columns: increasing number, product, declared date / effective date. So the two tables differ only for the third column (declared date / effective date).
I would like to make a chart like this:
where on the x axis there is the date and on the y axis there is the product. I would obtaine two line: the line obtanied by crossing the product and the declared date and the line obtanied by crossing the product and the effective data, on this graph.