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AVG

Sintassi

AVG([DISTINCT] espr)

Spiegazione

Restituisce la media aritmetica di espr. Con l'opzione DISTINCT si ottiene la media dei valori unici di espr.

AVG() restituisce NULL se non vi sono righe.

Esempi

SELECT nome_studente, AVG(voto_esame)
       FROM studenti
       GROUP BY nome_studente;
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