This topic contains an example of a line bar combo chart.
RETURN NumCases AS SELECT AVG("Unit Sale Price ($)") AS "Avg Sales Price", AVG("Product Avg National Sales Price ($)") AS "Avg National Sales Price" GROUP BY "Varietals" ORDER BY "Avg National Sales Price"
It produces a line bar combo chart comparing the "Avg Sales Price" metric to the "Avg National Sales Price" for each varietal: