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-- Query 26
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SELECT
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serveur.numserveur,
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serveur.nomserveur
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FROM serveur
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WHERE
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NOT EXISTS (
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SELECT *
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FROM facture
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WHERE facture.numserveur = serveur.numserveur
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);
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/* == RESULT ==
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"numserveur","nomserveur"
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54,"Séré Alain"
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*/
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