From 6c120acab39a9258c0e66c732ed53111428ec650 Mon Sep 17 00:00:00 2001
From: Arthur DANJOU <arthurdanjou@outlook.fr>
Date: Thu, 2 Oct 2025 11:45:01 +0200
Subject: [PATCH] =?UTF-8?q?Refactor=20les=20requ=C3=AAtes=20SQL=20pour=20u?=
 =?UTF-8?q?tiliser=20des=20jointures=20explicites=20et=20ajouter=20une=20a?=
 =?UTF-8?q?lternative=20avec=20MIN=20pour=20la=20comparaison=20de=20dates.?=
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 M2/SQL/scripts/TP2.sql | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/M2/SQL/scripts/TP2.sql b/M2/SQL/scripts/TP2.sql
index fc7a8f0..2428d83 100644
--- a/M2/SQL/scripts/TP2.sql
+++ b/M2/SQL/scripts/TP2.sql
@@ -64,16 +64,14 @@ SELECT Enom, Salaire FROM Employe WHERE Salaire < 4000;
 -- Q2.6
 SELECT 'Q2.6';
 
-SELECT Enom, Prof FROM Employe e
-JOIN Departement d ON e.Dep = d.Dno 
-WHERE d.Ville = 'Lyon';
+SELECT e.Enom, e.Prof FROM Employe e, Departement d
+WHERE e.Dep = d.Dno AND d.Ville = 'Lyon';
 
 -- Q2.7
 SELECT 'Q2.7';
 
-SELECT Enom, Prof FROM Employe e
-JOIN Departement d ON d.Directeur = e.Eno
-WHERE d.Dnom = 'Production';
+SELECT Enom, Prof FROM Employe e, Departement d
+WHERE d.Directeur = e.Eno AND d.Dnom = 'Production';
 
 -- Q2.8
 SELECT 'Q2.8';
@@ -175,6 +173,13 @@ WHERE e.Date_Emb < ALL (
     WHERE e2.Dep = 2
 );
 
+-- As an alternative to ALL, we can use a subquery with MIN. ALL is not supported in SQLite.
+SELECT e.Enom, e.Date_Emb FROM Employe e
+WHERE e.Date_Emb < (
+    SELECT MIN(e2.Date_Emb) FROM Employe e2
+    WHERE e2.Dep = 2
+);
+
 -- Q2.21
 SELECT 'Q2.21';