diff --git a/exercices/correction/serie 6/1.sql b/exercices/correction/serie 6/1.sql
new file mode 100644
index 0000000000000000000000000000000000000000..a296f4572070a91c2b9de5549b801c85100af061
--- /dev/null
+++ b/exercices/correction/serie 6/1.sql
@@ -0,0 +1,5 @@
+-- 1
+SELECT V.login, firstname, lastname, loyalty_points
+FROM Visitor as V
+INNER JOIN Fidelity as F ON V.login = F.login
+WHERE loyalty_points < 50;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/10.sql b/exercices/correction/serie 6/10.sql
new file mode 100644
index 0000000000000000000000000000000000000000..4c72f4f3b0970072af97ce0efdf5058f04298822
--- /dev/null
+++ b/exercices/correction/serie 6/10.sql
@@ -0,0 +1,11 @@
+-- 10
+SELECT *
+FROM Visitor
+WHERE login NOT IN (SELECT login FROM Registration);
+
+--ou
+
+SELECT *
+FROM Visitor
+LEFT JOIN Registration ON Visitor.login = Registration.login
+WHERE id_conference IS NULL;
diff --git a/exercices/correction/serie 6/11.sql b/exercices/correction/serie 6/11.sql
new file mode 100644
index 0000000000000000000000000000000000000000..1d22a99dca64585101e469b6240efe543955c394
--- /dev/null
+++ b/exercices/correction/serie 6/11.sql
@@ -0,0 +1,5 @@
+-- 11
+SELECT V.login, firstname, lastname, COUNT(id_conference)
+FROM Visitor AS V
+LEFT JOIN Registration AS R ON V.login = R.login
+GROUP BY V.login;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/12.sql b/exercices/correction/serie 6/12.sql
new file mode 100644
index 0000000000000000000000000000000000000000..fa51ae0eadc1173196ec3e76440606c4b021dd73
--- /dev/null
+++ b/exercices/correction/serie 6/12.sql
@@ -0,0 +1,5 @@
+-- 12
+SELECT lastname, firstname, start_date, end_date, name
+FROM Speaker AS S
+INNER JOIN Stay AS ST ON S.login = ST.login
+INNER JOIN Hotel AS H ON ST.id_hotel = H.id_hotel;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/13.sql b/exercices/correction/serie 6/13.sql
new file mode 100644
index 0000000000000000000000000000000000000000..32e71f9a49669c7425405f96fdd8a6b9e2afeb14
--- /dev/null
+++ b/exercices/correction/serie 6/13.sql
@@ -0,0 +1,6 @@
+-- 13
+SELECT T.title, COUNT(DISTINCT login)
+FROM Topic AS T
+LEFT JOIN Conference AS C ON T.title = C.title
+LEFT JOIN Registration AS R ON C.id_conference = R.id_conference
+GROUP BY T.title;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/14.sql b/exercices/correction/serie 6/14.sql
new file mode 100644
index 0000000000000000000000000000000000000000..6fbb188a3c88f844b18d810ba57adb22206564fe
--- /dev/null
+++ b/exercices/correction/serie 6/14.sql
@@ -0,0 +1,11 @@
+-- 14
+SELECT C.name, start_date, end_date,
+(
+ SELECT COUNT(R.login) FROM Registration AS R
+ WHERE C.id_conference = R.id_conference
+) AS Visitors,
+(
+ SELECT COUNT(P.login) FROM Participation AS P
+ WHERE C.id_conference = P.id_conference
+) AS Speakers
+FROM Conference AS C;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/15.sql b/exercices/correction/serie 6/15.sql
new file mode 100644
index 0000000000000000000000000000000000000000..e98bc66a5a81f4710f05e0255eb7eb9301cd9065
--- /dev/null
+++ b/exercices/correction/serie 6/15.sql
@@ -0,0 +1,6 @@
+-- 15
+SELECT name, SUM(IFNULL(fees,0)) AS total
+FROM Conference AS C
+LEFT JOIN Participation AS P ON C.id_conference = P.id_conference
+GROUP BY C.id_conference
+ORDER BY total DESC;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/16.sql b/exercices/correction/serie 6/16.sql
new file mode 100644
index 0000000000000000000000000000000000000000..1a17493da96a6ef616293e1f36acef45f605153b
--- /dev/null
+++ b/exercices/correction/serie 6/16.sql
@@ -0,0 +1,6 @@
+-- 16
+SELECT T.title, SUM(IFNULL(fees,0)) AS S
+FROM Topic AS T LEFT JOIN Conference AS C ON T.title = C.title
+LEFT JOIN Participation AS P ON C.id_conference = P.id_conference
+GROUP BY T.title
+HAVING S < 20000;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/17.sql b/exercices/correction/serie 6/17.sql
new file mode 100644
index 0000000000000000000000000000000000000000..e9c745b9de36c9676685b9a026a2a528cc3f0141
--- /dev/null
+++ b/exercices/correction/serie 6/17.sql
@@ -0,0 +1,5 @@
+-- 17
+SELECT S.login, firstname, lastname, COUNT(id_conference)
+FROM Speaker AS S
+LEFT JOIN Participation AS P ON S.login = P.login
+GROUP BY S.login;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/18.sql b/exercices/correction/serie 6/18.sql
new file mode 100644
index 0000000000000000000000000000000000000000..6278899e1e0c3bb276c087bdedae41b4d0f618fe
--- /dev/null
+++ b/exercices/correction/serie 6/18.sql
@@ -0,0 +1,26 @@
+-- 18
+SELECT login, firstname, lastname
+FROM Speaker
+WHERE NOT EXISTS (
+ SELECT *
+ FROM Participation
+ WHERE Participation.login = Speaker.login
+);
+
+SELECT login, firstname, lastname
+FROM Speaker
+WHERE login NOT IN (
+ SELECT login
+ FROM Participation
+);
+
+SELECT Speaker.login, firstname, lastname
+FROM Speaker
+LEFT JOIN Participation ON Speaker.login = Participation.login
+WHERE Participation.login IS NULL;
+
+SELECT Speaker.login, firstname, lastname
+FROM Speaker
+LEFT JOIN Participation ON Speaker.login = Participation.login
+GROUP BY Speaker.login
+HAVING COUNT(Participation.id_conference) = 0;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/19.sql b/exercices/correction/serie 6/19.sql
new file mode 100644
index 0000000000000000000000000000000000000000..c385333d0043245f3bffc5f5375b921d95989a63
--- /dev/null
+++ b/exercices/correction/serie 6/19.sql
@@ -0,0 +1,6 @@
+-- 19
+SELECT DISTINCT T.title
+FROM Topic AS T
+INNER JOIN Conference AS C ON C.title = T.title
+INNER JOIN Participation AS P ON C.id_conference = P.id_conference
+WHERE login LIKE "stregunna14";
\ No newline at end of file
diff --git a/exercices/correction/serie 6/2.sql b/exercices/correction/serie 6/2.sql
new file mode 100644
index 0000000000000000000000000000000000000000..014f5daf5884336a40f10c02820f740bfa40758a
--- /dev/null
+++ b/exercices/correction/serie 6/2.sql
@@ -0,0 +1,12 @@
+-- 2
+SELECT V.login, firstname, lastname, loyalty_points
+FROM Visitor as V
+LEFT JOIN Fidelity as F ON V.login = F.login
+WHERE IFNULL(loyalty_points,0) < 50 AND V.login LIKE "l%";
+
+-- ou
+
+SELECT V.login, firstname, lastname, loyalty_points
+FROM Visitor as V
+LEFT JOIN Fidelity as F ON V.login = F.login
+WHERE (loyalty_points < 50 OR loyalty_points IS NULL) AND V.login GLOB "l*";
\ No newline at end of file
diff --git a/exercices/correction/serie 6/20.sql b/exercices/correction/serie 6/20.sql
new file mode 100644
index 0000000000000000000000000000000000000000..d868c8e3610e85a9d32aa5dc9e892bdc0c0505c0
--- /dev/null
+++ b/exercices/correction/serie 6/20.sql
@@ -0,0 +1,7 @@
+-- 20
+SELECT DISTINCT S.login, firstname, lastname, fees
+FROM Speaker AS S
+INNER JOIN Participation AS P ON S.login = P.login
+WHERE fees = (
+ SELECT MAX(fees) FROM Participation
+);
\ No newline at end of file
diff --git a/exercices/correction/serie 6/21.sql b/exercices/correction/serie 6/21.sql
new file mode 100644
index 0000000000000000000000000000000000000000..2dd9d50d5528a87130f3c320a94f5fe6b68effa1
--- /dev/null
+++ b/exercices/correction/serie 6/21.sql
@@ -0,0 +1,30 @@
+-- 21
+SELECT Speaker.login, firstname, lastname
+FROM Speaker INNER JOIN Participation ON Speaker.login = Participation.login
+GROUP BY Speaker.login
+HAVING SUM(fees) = (SELECT MAX(SUM) FROM
+(SELECT login, SUM(fees) AS SUM
+FROM Participation
+GROUP BY login));
+
+
+SELECT S.login, firstname, lastname, SUM(fees) AS F
+FROM Speaker AS S
+INNER JOIN Participation AS P ON S.login = P.login
+GROUP BY S.login
+HAVING F = (
+ SELECT MAX(S) FROM (
+ SELECT SUM(fees) AS S FROM Participation GROUP BY login
+ ) AS G
+);
+
+
+WITH GBY (login, firstname, lastname, sum) AS (
+ SELECT S.login, firstname, lastname, SUM(fees) AS F
+ FROM Speaker AS S
+ INNER JOIN Participation AS P ON S.login = P.login
+ GROUP BY S.login
+)
+SELECT login, firstname, lastname, sum
+FROM GBY
+WHERE sum = (SELECT MAX(sum) FROM GBY);
\ No newline at end of file
diff --git a/exercices/correction/serie 6/22.sql b/exercices/correction/serie 6/22.sql
new file mode 100644
index 0000000000000000000000000000000000000000..289298e2bd8d84b93c0e92c2cd7e2ae96e4da658
--- /dev/null
+++ b/exercices/correction/serie 6/22.sql
@@ -0,0 +1,5 @@
+-- 22
+SELECT COUNT(DISTINCT login)
+FROM Participation
+INNER JOIN Conference USING (id_conference)
+WHERE strftime("%Y", start_date) = "2019";
\ No newline at end of file
diff --git a/exercices/correction/serie 6/23.sql b/exercices/correction/serie 6/23.sql
new file mode 100644
index 0000000000000000000000000000000000000000..5781f5749828849b8c8656279bf8cbb965ef1ead
--- /dev/null
+++ b/exercices/correction/serie 6/23.sql
@@ -0,0 +1,10 @@
+-- 23
+SELECT *
+FROM Visitor
+WHERE login NOT IN (
+ SELECT Visitor.login
+ FROM Visitor
+ INNER JOIN Registration USING (login)
+ INNER JOIN Conference USING (id_conference)
+ WHERE strftime("%Y", start_date) = "2019"
+);
\ No newline at end of file
diff --git a/exercices/correction/serie 6/24.sql b/exercices/correction/serie 6/24.sql
new file mode 100644
index 0000000000000000000000000000000000000000..b2c9b5253609cacfdfa69081cab6b52a9dd6777c
--- /dev/null
+++ b/exercices/correction/serie 6/24.sql
@@ -0,0 +1,6 @@
+-- 24
+SELECT substr(A.lastname,1,2) AS SUB, A.login, A.firstname, A.lastname, B.login, B.firstname, B.lastname
+FROM Visitor AS A
+INNER JOIN Visitor AS B ON substr(A.lastname,1,2) = substr(B.lastname,1,2)
+WHERE A.login > B.login
+ORDER BY SUB;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/3.sql b/exercices/correction/serie 6/3.sql
new file mode 100644
index 0000000000000000000000000000000000000000..dad4f2b45af83b8ed6b7932a02135c6f993faacd
--- /dev/null
+++ b/exercices/correction/serie 6/3.sql
@@ -0,0 +1,4 @@
+-- 3
+SELECT firstname, lastname, loyalty_points
+FROM Visitor as V
+INNER JOIN Fidelity as F ON V.login = F.login;
diff --git a/exercices/correction/serie 6/4.sql b/exercices/correction/serie 6/4.sql
new file mode 100644
index 0000000000000000000000000000000000000000..a18ae10fe310ab945a1c88055429c50826620cf1
--- /dev/null
+++ b/exercices/correction/serie 6/4.sql
@@ -0,0 +1,10 @@
+-- 4
+SELECT *
+FROM Conference
+WHERE title IN ("databases", "microservices");
+
+-- ou
+
+SELECT *
+FROM Conference
+WHERE title IS "databases" OR title IS "microservices";
\ No newline at end of file
diff --git a/exercices/correction/serie 6/5_et_6.sql b/exercices/correction/serie 6/5_et_6.sql
new file mode 100644
index 0000000000000000000000000000000000000000..20c2198e4f86731f17227bb9fe02d32ce030acdc
--- /dev/null
+++ b/exercices/correction/serie 6/5_et_6.sql
@@ -0,0 +1,7 @@
+-- 5
+SELECT title
+FROM Topic;
+
+-- 6
+SELECT DISTINCT title
+FROM Conference;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/7.sql b/exercices/correction/serie 6/7.sql
new file mode 100644
index 0000000000000000000000000000000000000000..87d96f6a135c94ba98bf28c27a82a9b5112566fe
--- /dev/null
+++ b/exercices/correction/serie 6/7.sql
@@ -0,0 +1,28 @@
+-- 7
+-- non standard, sqlite only
+SELECT *
+FROM Visitor
+INTERSECT
+SELECT *
+FROM Speaker;
+
+-- standard
+SELECT *
+FROM Visitor
+INNER JOIN Speaker ON Visitor.login = Speaker.login;
+
+-- sous-requête IN
+SELECT *
+FROM Visitor
+WHERE login IN (
+ SELECT login FROM Speaker
+);
+
+-- sous-requête EXISTS
+SELECT *
+FROM Visitor
+WHERE EXISTS (
+ SELECT login FROM Speaker
+ WHERE Speaker.login = Visitor.login
+);
+
diff --git a/exercices/correction/serie 6/8.sql b/exercices/correction/serie 6/8.sql
new file mode 100644
index 0000000000000000000000000000000000000000..c7694624ba7dbb1eb8e8b0e742e5cdc7b7f53958
--- /dev/null
+++ b/exercices/correction/serie 6/8.sql
@@ -0,0 +1,6 @@
+-- 8
+SELECT *
+FROM Speaker
+WHERE login NOT IN (
+ SELECT login FROM Visitor
+);
\ No newline at end of file
diff --git a/exercices/correction/serie 6/9.sql b/exercices/correction/serie 6/9.sql
new file mode 100644
index 0000000000000000000000000000000000000000..a97fe752c398414ae3654271a28020afd24e8555
--- /dev/null
+++ b/exercices/correction/serie 6/9.sql
@@ -0,0 +1,5 @@
+-- 9
+SELECT Topic.title, COUNT(id_conference)
+FROM Topic
+LEFT JOIN Conference ON Conference.title = Topic.title
+GROUP BY Topic.title;
\ No newline at end of file
diff --git a/exercices/correction/serie 6/COM 1 2 3.sql b/exercices/correction/serie 6/COM 1 2 3.sql
new file mode 100644
index 0000000000000000000000000000000000000000..520bdcf153130e3e8ede3c9a4ffb9b7c29a9e1ed
--- /dev/null
+++ b/exercices/correction/serie 6/COM 1 2 3.sql
@@ -0,0 +1,13 @@
+-- COMMANDES
+
+-- 1
+INSERT INTO Visitor VALUES ('toto21', 'Di', 'Dju');
+
+-- 2
+INSERT INTO Fidelity VALUES ('toto21', 50);
+
+-- 3
+INSERT INTO Registration
+SELECT 'toto21', id_conference
+FROM Conference
+WHERE name = 'CurryOn';
\ No newline at end of file
diff --git a/exercices/correction/serie 6/COM 4 5.sql b/exercices/correction/serie 6/COM 4 5.sql
new file mode 100644
index 0000000000000000000000000000000000000000..52892d2940f7f485aa8da21fdeeaf3d12497b077
--- /dev/null
+++ b/exercices/correction/serie 6/COM 4 5.sql
@@ -0,0 +1,10 @@
+-- 4
+UPDATE Fidelity
+SET loyalty_points = loyalty_points * 2;
+
+-- 5
+INSERT INTO Fidelity
+SELECT login, 50
+FROM Visitor
+WHERE login NOT IN (SELECT login FROM Fidelity);
+
diff --git a/exercices/correction/serie 6/conf.sql b/exercices/correction/serie 6/conf.sql
new file mode 100644
index 0000000000000000000000000000000000000000..26fbce69c3619e53f73e713358f53d9ac29d96f8
--- /dev/null
+++ b/exercices/correction/serie 6/conf.sql
@@ -0,0 +1,278 @@
+-- 1
+SELECT V.login, firstname, lastname, loyalty_points
+FROM Visitor as V
+INNER JOIN Fidelity as F ON V.login = F.login
+WHERE loyalty_points < 50;
+
+-- 2
+SELECT V.login, firstname, lastname, loyalty_points
+FROM Visitor as V
+LEFT JOIN Fidelity as F ON V.login = F.login
+WHERE IFNULL(loyalty_points,0) < 50 AND V.login LIKE "l%";
+
+SELECT V.login, firstname, lastname, loyalty_points
+FROM Visitor as V
+LEFT JOIN Fidelity as F ON V.login = F.login
+WHERE (loyalty_points < 50 OR loyalty_points IS NULL) AND V.login GLOB "l*";
+
+-- 3
+SELECT firstname, lastname, loyalty_points
+FROM Visitor as V
+INNER JOIN Fidelity as F ON V.login = F.login;
+
+-- 4
+SELECT *
+FROM Conference
+WHERE title IN ("databases", "microservices");
+
+SELECT *
+FROM Conference
+WHERE title IS "databases" OR title IS "microservices";
+
+-- 5
+SELECT title
+FROM Topic;
+
+-- 6
+SELECT DISTINCT title
+FROM Conference;
+
+-- 7
+-- non standard, sqlite only
+SELECT *
+FROM Visitor
+INTERSECT
+SELECT *
+FROM Speaker;
+
+-- standard
+SELECT *
+FROM Visitor
+INNER JOIN Speaker ON Visitor.login = Speaker.login;
+
+-- sous-requête IN
+SELECT *
+FROM Visitor
+WHERE login IN (
+ SELECT login FROM Speaker
+);
+
+-- sous-requête EXISTS
+SELECT *
+FROM Visitor
+WHERE EXISTS (
+ SELECT login FROM Speaker
+ WHERE Speaker.login = Visitor.login
+);
+
+
+-- 8
+SELECT *
+FROM Speaker
+WHERE login NOT IN (
+ SELECT login FROM Visitor
+);
+
+-- 9
+SELECT Topic.title, COUNT(id_conference)
+FROM Topic
+LEFT JOIN Conference ON Conference.title = Topic.title
+GROUP BY Topic.title;
+
+-- 10
+SELECT *
+FROM Visitor
+WHERE login NOT IN (SELECT login FROM Registration);
+
+SELECT *
+FROM Visitor
+LEFT JOIN Registration ON Visitor.login = Registration.login
+WHERE id_conference IS NULL;
+
+-- 11
+SELECT V.login, firstname, lastname, COUNT(id_conference)
+FROM Visitor AS V
+LEFT JOIN Registration AS R ON V.login = R.login
+GROUP BY V.login;
+
+
+-- 12
+SELECT lastname, firstname, start_date, end_date, name
+FROM Speaker AS S
+INNER JOIN Stay AS ST ON S.login = ST.login
+INNER JOIN Hotel AS H ON ST.id_hotel = H.id_hotel;
+
+-- 13
+SELECT T.title, COUNT(DISTINCT login)
+FROM Topic AS T
+LEFT JOIN Conference AS C ON T.title = C.title
+LEFT JOIN Registration AS R ON C.id_conference = R.id_conference
+GROUP BY T.title;
+
+-- 14
+SELECT C.name, start_date, end_date,
+(
+ SELECT COUNT(R.login) FROM Registration AS R
+ WHERE C.id_conference = R.id_conference
+) AS Visitors,
+(
+ SELECT COUNT(P.login) FROM Participation AS P
+ WHERE C.id_conference = P.id_conference
+) AS Speakers
+FROM Conference AS C;
+
+-- 15
+SELECT name, SUM(IFNULL(fees,0)) AS total
+FROM Conference AS C
+LEFT JOIN Participation AS P ON C.id_conference = P.id_conference
+GROUP BY C.id_conference
+ORDER BY total DESC;
+
+-- 16
+SELECT T.title, SUM(IFNULL(fees,0)) AS S
+FROM Topic AS T LEFT JOIN Conference AS C ON T.title = C.title
+LEFT JOIN Participation AS P ON C.id_conference = P.id_conference
+GROUP BY T.title
+HAVING S < 20000;
+
+-- 17
+SELECT S.login, firstname, lastname, COUNT(id_conference)
+FROM Speaker AS S
+LEFT JOIN Participation AS P ON S.login = P.login
+GROUP BY S.login;
+
+-- 18
+SELECT login, firstname, lastname
+FROM Speaker
+WHERE NOT EXISTS (
+ SELECT *
+ FROM Participation
+ WHERE Participation.login = Speaker.login
+);
+
+SELECT login, firstname, lastname
+FROM Speaker
+WHERE login NOT IN (
+ SELECT login
+ FROM Participation
+);
+
+SELECT Speaker.login, firstname, lastname
+FROM Speaker
+LEFT JOIN Participation ON Speaker.login = Participation.login
+WHERE Participation.login IS NULL;
+
+SELECT Speaker.login, firstname, lastname
+FROM Speaker
+LEFT JOIN Participation ON Speaker.login = Participation.login
+GROUP BY Speaker.login
+HAVING COUNT(Participation.id_conference) = 0;
+
+-- 19
+SELECT DISTINCT T.title
+FROM Topic AS T
+INNER JOIN Conference AS C ON C.title = T.title
+INNER JOIN Participation AS P ON C.id_conference = P.id_conference
+WHERE login LIKE "stregunna14";
+
+-- 20
+SELECT DISTINCT S.login, firstname, lastname, fees
+FROM Speaker AS S
+INNER JOIN Participation AS P ON S.login = P.login
+WHERE fees = (
+ SELECT MAX(fees) FROM Participation
+);
+
+
+
+
+
+
+
+-- 21
+SELECT Speaker.login, firstname, lastname
+FROM Speaker INNER JOIN Participation ON Speaker.login = Participation.login
+GROUP BY Speaker.login
+HAVING SUM(fees) = (SELECT MAX(SUM) FROM
+(SELECT login, SUM(fees) AS SUM
+FROM Participation
+GROUP BY login));
+
+
+SELECT S.login, firstname, lastname, SUM(fees) AS F
+FROM Speaker AS S
+INNER JOIN Participation AS P ON S.login = P.login
+GROUP BY S.login
+HAVING F = (
+ SELECT MAX(S) FROM (
+ SELECT SUM(fees) AS S FROM Participation GROUP BY login
+ ) AS G
+);
+
+
+WITH GBY (login, firstname, lastname, sum) AS (
+ SELECT S.login, firstname, lastname, SUM(fees) AS F
+ FROM Speaker AS S
+ INNER JOIN Participation AS P ON S.login = P.login
+ GROUP BY S.login
+)
+SELECT login, firstname, lastname, sum
+FROM GBY
+WHERE sum = (SELECT MAX(sum) FROM GBY);
+
+
+-- 22
+SELECT COUNT(DISTINCT login)
+FROM Participation
+INNER JOIN Conference USING (id_conference)
+WHERE strftime("%Y", start_date) = "2019";
+
+
+
+
+
+-- 23
+SELECT *
+FROM Visitor
+WHERE login NOT IN (
+ SELECT Visitor.login
+ FROM Visitor
+ INNER JOIN Registration USING (login)
+ INNER JOIN Conference USING (id_conference)
+ WHERE strftime("%Y", start_date) = "2019"
+);
+
+-- 24
+SELECT substr(A.lastname,1,2) AS SUB, A.login, A.firstname, A.lastname, B.login, B.firstname, B.lastname
+FROM Visitor AS A
+INNER JOIN Visitor AS B ON substr(A.lastname,1,2) = substr(B.lastname,1,2)
+WHERE A.login > B.login
+ORDER BY SUB;
+
+
+
+
+
+-- COMMANDES
+
+-- 1
+INSERT INTO Visitor VALUES ('toto21', 'Di', 'Dju');
+
+-- 2
+INSERT INTO Fidelity VALUES ('toto21', 50);
+
+-- 3
+INSERT INTO Registration
+SELECT 'toto21', id_conference
+FROM Conference
+WHERE name = 'CurryOn';
+
+-- 4
+UPDATE Fidelity
+SET loyalty_points = loyalty_points * 2;
+
+-- 5
+INSERT INTO Fidelity
+SELECT login, 50
+FROM Visitor
+WHERE login NOT IN (SELECT login FROM Fidelity);
\ No newline at end of file
diff --git a/exercices/correction/serie5.pdf b/exercices/correction/serie5.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..5a98822d02929c7a7e35a676ac1f5a883a3db30c
Binary files /dev/null and b/exercices/correction/serie5.pdf differ