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Refactor les requêtes SQL pour utiliser des jointures explicites et ajouter une alternative avec MIN pour la comparaison de dates.

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Arthur Danjou
2025-10-02 11:45:01 +02:00
parent 493a79735d
commit 2647de10f9
1 changed files with 11 additions and 6 deletions
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17
M2/SQL/scripts/TP2.sql
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@@ -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';