thanks for your reply,
i don't use the id column as the pk because I the combinaison of PKdetermine a unique user.
for example a personn:
name,surname and birthday are PK determine a unique personn.
if i use id as the PK,if i insert again the same information,i duplicate my data.But i want aunique data.I can test with different request but it 's stupid cause PK are a good tool to control duplicate entry
thanks
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