I am new to SQL. I want to add lines to a table without creating duplicates, but I keep getting errors and I don't know why:

```
INSERT INTO [P ET FA] (id_danger, P, FA)
    (SELECT 
         measure.id_danger, SUM(mesure.valeur_mesure) AS P, SUM(mesure.Val) AS FA
     FROM mesure
     GROUP BY mesure.id_danger)
WHERE mesure.id_danger != [P ET FA].id_danger

```