transferred Code Ocean from original repository to GitHub

db/seeds/sql_select/comparator.rb

@@ -0,0 +1,12 @@
+require 'sqlite3'
+
+REFERENCE_QUERY = File.new('reference.sql', 'r').read
+STUDENT_QUERY = File.new('exercise.sql', 'r').read
+
+database = SQLite3::Database.new('/database.db')
+
+missing_tuples = database.execute(REFERENCE_QUERY) - database.execute(STUDENT_QUERY)
+unexpected_tuples = database.execute(STUDENT_QUERY) - database.execute(REFERENCE_QUERY)
+
+puts("Missing tuples: #{missing_tuples}")
+puts("Unexpected tuples: #{unexpected_tuples}")

db/seeds/sql_select/reference.sql

@@ -0,0 +1 @@
+SELECT * FROM people WHERE name LIKE '% Doe';