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+-- 🔍 DIAGNOSTIC SIMPLE - Une requête à la fois
+-- Copiez chaque ligne et exécutez séparément
+
+-- 1. Combien d'enregistrements dans chaque table ?
+SELECT COUNT(*) FROM suppliers;
+
+-- 2. 
+SELECT COUNT(*) FROM groups;  
+
+-- 3.
+SELECT COUNT(*) FROM users;
+
+-- 4. Si suppliers > 0, affichez les premiers
+SELECT id, name FROM suppliers LIMIT 3;
+
+-- 5. Si groups > 0, affichez les premiers  
+SELECT id, name FROM groups LIMIT 3;
+
+-- 6. Si users > 0, affichez les premiers
+SELECT id, username FROM users LIMIT 3;
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