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backpackerhh / core-set.sql
Last active July 15, 2024 22:07
SQL - Social-Network Query Exercises
-- 1. Find the names of all students who are friends with someone named Gabriel.
SELECT H1.name
FROM Highschooler H1
INNER JOIN Friend ON H1.ID = Friend.ID1
INNER JOIN Highschooler H2 ON H2.ID = Friend.ID2
WHERE H2.name = "Gabriel";
-- 2. For every student who likes someone 2 or more grades younger than themselves, return that student's name and grade, and the name and grade of the student they like.