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-- Query 21
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SELECT
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serveur.villeserveur as 'ville',
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COUNT(serveur.numserveur) as 'nb serveurs'
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FROM
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serveur
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GROUP BY serveur.villeserveur;
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/* == RESULT ==
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"Ville","Nb Serveurs"
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"BAVILLIERS",1
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"BELFORT",2
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"DELLE",1
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"DIJON",1
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*/
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