Introduction
Dictionary database
Instruction
Okay, try this one!
Exercise
List all pairs of full siblings. Full siblings are people who have the same mother and the same father. Name the columns with sibling names younger_sibling and older_sibling (use column year_born to identify who is younger).
You can assume that in our database no two siblings were born in the same year and there are no more than two siblings per family.
Stuck? Here's a hint!
Type:
SELECT ys.name AS younger_sibling, os.name AS older_sibling FROM person AS ys JOIN person AS os ON ys.mother_id = os.mother_id AND ys.father_id = os.father_id WHERE ys.year_born > os.year_born
