Regroupe la table ({[custID = 1, price = 20], custID = 2, price = 10], custID = 2, price = 20], custID = 1, price = 10], ...

Regroupe la table ({[custID = 1, price = 20], [custID = 2, price = 10], [custID = 2, price = 20], [custID = 1, price = 10], [custID = 3, price = 20], [custID = 3, price = 5]}) par [custID], en ajoutant une colonne d'agrégat [total] qui contient la somme des prix ("each List.Sum([price])").