diff --git a/20231130/Zeichen_123.pdf b/20231130/Zeichen_123.pdf
new file mode 120000
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@@ -0,0 +1 @@
+../common/Zeichen_123.pdf
\ No newline at end of file
diff --git a/20231130/dbs-20231130.pdf b/20231130/dbs-20231130.pdf
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diff --git a/20231130/dbs-20231130.tex b/20231130/dbs-20231130.tex
new file mode 100644
index 0000000000000000000000000000000000000000..4a039d911b98ac1088d0707800db846ce3b97f45
--- /dev/null
+++ b/20231130/dbs-20231130.tex
@@ -0,0 +1,464 @@
+% dbs-20221130.pdf - Lecture Slides on Databases and Information Security
+% Copyright (C) 2023 Peter Gerwinski
+%
+% This document is free software: you can redistribute it and/or
+% modify it either under the terms of the Creative Commons
+% Attribution-ShareAlike 3.0 License, or under the terms of the
+% GNU General Public License as published by the Free Software
+% Foundation, either version 3 of the License, or (at your option)
+% any later version.
+%
+% This document is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this document. If not, see <http://www.gnu.org/licenses/>.
+%
+% You should have received a copy of the Creative Commons
+% Attribution-ShareAlike 3.0 Unported License along with this
+% document. If not, see <http://creativecommons.org/licenses/>.
+
+% README: Transaktionen, Indizierung, GUI-Zugriff
+
+\documentclass[10pt,t]{beamer}
+
+\usepackage{pgslides}
+
+\newcommand{\vfilll}{\vspace{0pt plus 1filll}}
+
+\newcommand{\underconstruction}{%
+ \begin{picture}(0,0)
+ \put(11,1.2){\makebox(0,0)[b]{\includegraphics[width=1.5cm]{Zeichen_123.pdf}}}
+ \put(11,0.9){\makebox(0,0)[t]{\shortstack{Änderungen\\vorbehalten}}}
+ \end{picture}}
+
+\title{Datenbanken und Datensicherheit}
+\author{Prof.\ Dr.\ rer.\ nat.\ Peter Gerwinski}
+\date{30.\ November 2023}
+
+\begin{document}
+
+\maketitleframe
+
+\nosectionnonumber{\inserttitle}
+
+\begin{frame}
+
+ \shownosectionnonumber
+
+ \begin{itemize}
+ \item[\textbf{1}] \textbf{Einführung}
+ \hfill\makebox(0,0)[br]{\raisebox{2.25ex}{\url{https://gitlab.cvh-server.de/pgerwinski/dbs}}}%
+ \item[\textbf{2}] \textbf{Kurzeinführung Unix}
+ \item[\textbf{3}] \textbf{Kurzeinführung TCP/IP}
+ \item[\textbf{4}] \textbf{Relationale Datenbanken}
+ \begin{itemize}
+ \vspace*{-\smallskipamount}
+ \item[\textbf{\dots}]
+ \item[4.3] Normalformen
+ \color{medgreen}
+ \item[4.4] Verknüpfungen von Tabellen
+ \item[4.5] Sichten
+ \item[4.6] Schlüsselfelder
+ \item[4.7] Datensicherung
+ \color{red}
+ \item[4.8] Transaktionen
+ \item[4.9] Indizierung
+ \color{black}
+ \item[4.10] Trigger
+ \color{red}
+ \item[4.11] GUI-Zugriff
+ \color{black}
+ \item[4.12] Sonstige Datenbanken
+ \end{itemize}
+ \item[\textbf{5}] \textbf{Kryptographie}
+ \begin{itemize}
+ \item[5.1] Einführung
+ \vspace*{-\smallskipamount}
+ \item[\textbf{\dots}]
+ \end{itemize}
+ \vspace*{-\smallskipamount}
+ \item[\textbf{\dots}]
+ \end{itemize}
+
+ \vfilll
+ \underconstruction
+
+\end{frame}
+
+\setcounter{section}{3}
+\section{Relationale Datenbanken}
+\setcounter{subsection}{2}
+\subsection{Normalformen}
+
+\begin{frame}
+
+ \showsection
+ \showsubsection
+
+ Problem: Schlecht angelegte Datenbanken werden schnell inkonsistent.\\
+ Beliebte Fehler:
+ \begin{itemize}
+ \item
+ Speichern von mehreren Daten in demselben Tabelleneintrag\\
+ {\only<1->{\color{red}\textarrow\ 1.~Normalform}}
+ \item
+ Speichern von denselben Daten in verschiedenen Tabelleneinträgen\\
+ {\only<1->{\color{red}\textarrow\ 2.~Normalform}}
+ \item
+ implizite Zusammenhänge\\
+ {\only<1->{\color{red}\textarrow\ 3.~Normalform und Boyce-Codd-Normalform}}
+ \item
+ voneinander unabhängige Zusammenhänge in derselben Tabelle\\
+ {\only<1->{\color{red}\textarrow\ 4.~und 5.~Normalform}}
+ \end{itemize}
+
+ \begin{onlyenv}<1->
+ \medskip
+
+ {\color{red}Lösung: Normalformen}
+ \end{onlyenv}
+
+ \bigskip
+
+ Literatur: z.\,B.\ \url{https://de.wikipedia.org/wiki/Normalisierung_(Datenbank)}
+
+\end{frame}
+
+\subsection{Verknüpfungen von Tabellen}
+
+\begin{frame}
+
+ \showsection
+ \showsubsection
+
+ Problem: Gut angelegte Datenbanken ({\color{red}\textarrow\ Normalformen})\\
+ sind stark aufgesplittet.\\
+ Wie kann man sie weiterhin effizient benutzen?
+
+ \bigskip
+
+ Lösung: Verknüpfungen von Tabellen
+
+ \bigskip
+
+ SQL-Befehl: \lstinline[style=cmd]{JOIN}
+
+ \bigskip
+
+ Literatur: z.\,B.\ \url{https://de.wikipedia.org/wiki/SQL}
+
+\end{frame}
+
+\begin{frame}[fragile]
+
+ \showsection
+ \showsubsection
+
+ Was machen wir mit Tabelleneinträgen,\\
+ bei denen die \lstinline[style=cmd]{ON}-Bedingung
+ nicht erfüllt ist?
+
+ \medskip
+
+ \begin{lstlisting}[style=terminal]
+ ¡SELECT <Feld[er]> FROM <Tabelle1> [INNER] JOIN <Tabelle2>
+ ON <Tabelle1>.<Feld> = <Tabelle2>.<Feld>;¿
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \arrowitem
+ weglassen: \lstinline[style=cmd]{[INNER] JOIN}
+ \end{itemize}
+
+ \medskip
+
+ \begin{lstlisting}[style=terminal]
+ ¡SELECT <Feld[er]> FROM <Tabelle1> LEFT JOIN <Tabelle2>
+ ON <Tabelle1>.<Feld> = <Tabelle2>.<Feld>;¿
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \arrowitem
+ linke Tabelle trotzdem anzeigen
+ (mit \lstinline[style=cmd]{NULL}-Einträgen):
+ \lstinline[style=cmd]{LEFT JOIN}\\
+ (analog: \lstinline[style=cmd]{RIGHT JOIN} für rechte Tabelle)
+ \end{itemize}
+
+ \medskip
+
+ \begin{lstlisting}[style=terminal]
+ ¡SELECT <Feld[er]> FROM <Tabelle1> FULL JOIN <Tabelle2>
+ ON <Tabelle1>.<Feld> = <Tabelle2>.<Feld>;¿
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \arrowitem
+ beide Tabellen trotzdem anzeigen
+ (mit \lstinline[style=cmd]{NULL}-Einträgen):
+ \lstinline[style=cmd]|FULL JOIN|
+ \end{itemize}
+
+\end{frame}
+
+\subsection{Sichten}
+
+\begin{frame}[fragile]
+
+ \showsection
+ \showsubsection
+
+ \begin{lstlisting}[style=terminal]
+ ¡SELECT <Feld[er]> FROM <Tabelle1> [INNER] JOIN <Tabelle2>
+ ON <Tabelle1>.<Feld> = <Tabelle2>.<Feld>;¿
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \arrowitem
+ Wir betrachten beide Tabellen zusammen als eine große Tabelle.
+ \end{itemize}
+
+ \medskip
+
+ \begin{lstlisting}[style=terminal]
+ ¡CREATE VIEW <Sicht> AS
+ SELECT <Feld[er]> FROM <Tabelle1> JOIN <Tabelle2>
+ ON <Tabelle1>.<Feld> = <Tabelle2>.<Feld>;
+ SELECT <Feld[er]> FROM <Sicht> [WHERE ...];¿
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \arrowitem
+ Wir sprechen das Ergebnis genau wie eine Tabelle an.
+ \bigskip
+ \arrowitem
+ Es ist möglich, ohne Verlust an Komfort alle Daten in Normalform zu halten.
+ \end{itemize}
+
+\end{frame}
+
+\subsection{Schlüsselfelder}
+
+\begin{frame}[fragile]
+
+ \showsection
+ \showsubsection
+
+ \begin{lstlisting}[style=terminal]
+ ¡CREATE TABLE tabelle1 (
+ id INT PRIMARY KEY AUTO_INCREMENT,
+ ...
+ );
+ CREATE TABLE tabelle2 (
+ ...
+ tabelle1_id INT,
+ ...
+ FOREIGN KEY(tabelle1_id) REFERENCES tabelle1(id)
+ );
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \arrowitem
+ Dem DBMS mitteilen, welche Felder für \lstinline[style=cmd]{JOIN}
+ vorgesehen sind.
+ \arrowitem
+ Das DBMS kann mit auf Konsistenz achten.
+ \end{itemize}
+
+\end{frame}
+
+\subsection{Datensicherung}
+
+\begin{frame}[fragile]
+
+ \showsection
+ \showsubsection
+
+ \begin{lstlisting}[style=terminal]
+ $ ¡pg_dump --clean -h <Rechner> -U <User> -W <Datenbank>¿
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \item
+ Ausgabe des gesamten Datenbankinhalts\\
+ als SQL-Quelltext zur Standardausgabe
+ \arrowitem
+ keine Probleme mit sich evtl.\ ändernden Binärformaten
+ \item
+ Es ist möglich, den Inhalt direkt in einer Pipe weiterzuverarbeiten\\
+ (z.\,B.\ zu komprimieren).
+ \item
+ Zurückspielen: mit \lstinline[style=cmd]{psql}
+ \end{itemize}
+
+ \smallskip
+
+ \begin{lstlisting}[style=terminal]
+ $ ¡psql -h <Rechner> -U <User> -W <Datenbank> \
+ < <Ausgabe von pg_dump>¿
+ \end{lstlisting}
+
+ \smallskip
+
+ \begin{itemize}
+ \item
+ analog für \file{MariaDB}: \lstinline[style=cmd]{mariadb-dump}
+ \end{itemize}
+
+\end{frame}
+
+\subsection{Transaktionen}
+
+\begin{frame}[fragile]
+
+ \showsection
+ \showsubsection
+
+ \begin{itemize}
+ \item
+ Ziel: Wahrung der Konsistenz
+ \item
+ Methode: zusammengehörige Aktionen zu einer \newterm{Transaktion} zusammenfassen
+ \item
+ Beispiel: Überweisung\\
+ Betrag von einem Konto subtrahieren\\
+ und "`gleichzeitig"' zu einem anderen Konto addieren
+ \item
+ Realisierung in PostgreSQL:
+ \lstinline[style=cmd]{BEGIN;} \dots\ \lstinline[style=cmd]{COMMIT;}
+ \item
+ Realisierung in MariaDB:
+ \lstinline[style=cmd]{START TRANSACTION;} \dots\ \lstinline[style=cmd]{COMMIT;}
+ \item
+ Abbruch einer Transaktion:
+ \lstinline[style=cmd]{ROLLBACK;} statt \lstinline[style=cmd]{COMMIT;}
+ \end{itemize}
+
+\end{frame}
+
+\subsection{Indizierung}
+
+\begin{frame}[fragile]
+
+ \showsection
+ \showsubsection
+
+ \begin{itemize}
+ \item
+ Ziel: Performanzgewinn
+ \item
+ Methode: Spalten, in denen häufig gesucht wird, sortieren
+ \item
+ Beispiel: Datenbank mit Kontaktdaten\\
+ Suche nach Name, Adresse, Telefonnummer
+ \item
+ Realisierung in PostgreSQL und MariaDB:
+ \begin{lstlisting}[style=cmd,gobble=8]
+ CREATE INDEX <Indexname> ON <Tabellenname>
+ (
+ <Spaltenname>,
+ ...
+ );
+ \end{lstlisting}
+ \item
+ Vorteil: schnellere Suche (\lstinline[style=cmd]{SELECT}) in indizierten Spalten
+ \pause
+ \item
+ Nachteil: langsameres Einfügen/Ändern/Löschen
+ \end{itemize}
+
+\end{frame}
+
+\addtocounter{subsection}{1}
+
+\subsection{GUI-Zugriff}
+
+\begin{frame}
+
+ \showsection
+ \showsubsection
+
+ \begin{itemize}
+ \item
+ Anwendung nutzt DBMS-Client-Bibliothek\\
+ GUI-Programmierung: wie gewohnt
+ \item
+ Spezialfall: Web-Anwendung
+ \end{itemize}
+
+ \bigskip
+
+ Beispiel: Programmiersprache PHP
+ \begin{itemize}
+ \item
+ Integration in HTML-Quelltext: \lstinline{<?php ... ?>}
+ \item
+ Objekt zur Kommunikation mit Datenbanken: \lstinline{PDO}
+ \end{itemize}
+
+\end{frame}
+
+\iffalse
+
+\subsection{Sonstige Datenbanken}
+
+\begin{frame}
+
+ \showsection
+ \showsubsection
+
+ \begin{itemize}
+ \item
+ Eingebettete Datenbanken:\\
+ Berkeley DB, SQLite\\
+ Software-Bibliothek, keine Client-Server-Struktur
+ \item
+ Nicht-relationale Datenbanken:\\
+ dokumentenorientierte Datenbanken, noSQL\\
+ Performanz wichtiger als Konsistenz\\
+ \textarrow\ Applikationen stärker in Konsistenzprüfung eingebunden
+ \end{itemize}
+
+\end{frame}
+
+\section{Kryptographie}
+\subsection{Einführung}
+
+\begin{frame}
+
+ \showsection
+ \showsubsection
+
+ \begin{itemize}
+ \item
+ Verschlüsselung: symmetrisch, asymmetrisch, hybrid
+ \item
+ Hashes: Einwegfunktionen, Salt
+ \item
+ Signaturen, Zertifikate
+ \item
+ Schlüsselaustausch
+ \end{itemize}
+
+\end{frame}
+
+\fi
+
+\end{document}
diff --git a/20231130/indexing-01.txt b/20231130/indexing-01.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2e27969ccee94ed14bb66785ee3acf197e04afaa
--- /dev/null
+++ b/20231130/indexing-01.txt
@@ -0,0 +1,28 @@
+testdb=> SELECT * FROM account where number = 'DE12 3456 7890 ABCD EFGH IJ';
+ id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 1000001
+(1 Zeile)
+
+testdb=> CREATE INDEX index_account_number ON account ( number );
+CREATE INDEX
+testdb=> \d account
+ Tabelle »public.account«
+ Spalte | Typ | Sortierfolge | NULL erlaubt? | Vorgabewert
+---------+---------+--------------+---------------+-------------------------------------
+ id | integer | | not null | nextval('account_id_seq'::regclass)
+ number | text | | |
+ balance | integer | | |
+Indexe:
+ "account_pkey" PRIMARY KEY, btree (id)
+ "index_account_number" btree (number)
+Fremdschlüsselverweise von:
+ TABLE "customer" CONSTRAINT "customer_fkey_account_id" FOREIGN KEY (account_id) REFERENCES account(id)
+
+testdb=> SELECT * FROM account where number = 'DE12 3456 7890 ABCD EFGH IJ';
+ id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 1000001
+(1 Zeile)
+
+testdb=>
diff --git a/20231130/logo-hochschule-bochum-cvh-text-v2.pdf b/20231130/logo-hochschule-bochum-cvh-text-v2.pdf
new file mode 120000
index 0000000000000000000000000000000000000000..4aa99b8f81061aca6dcaf43eed2d9efef40555f8
--- /dev/null
+++ b/20231130/logo-hochschule-bochum-cvh-text-v2.pdf
@@ -0,0 +1 @@
+../common/logo-hochschule-bochum-cvh-text-v2.pdf
\ No newline at end of file
diff --git a/20231130/logo-hochschule-bochum.pdf b/20231130/logo-hochschule-bochum.pdf
new file mode 120000
index 0000000000000000000000000000000000000000..b6b9491e370e499c9276918182cdb82cb311bcd1
--- /dev/null
+++ b/20231130/logo-hochschule-bochum.pdf
@@ -0,0 +1 @@
+../common/logo-hochschule-bochum.pdf
\ No newline at end of file
diff --git a/20231130/pgslides.sty b/20231130/pgslides.sty
new file mode 120000
index 0000000000000000000000000000000000000000..5be1416f4216f076aa268901f52a15d775e43f64
--- /dev/null
+++ b/20231130/pgslides.sty
@@ -0,0 +1 @@
+../common/pgslides.sty
\ No newline at end of file
diff --git a/20231130/transactions-01.txt b/20231130/transactions-01.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0271a02accab36fb3afece1884a188daa87b9a7c
--- /dev/null
+++ b/20231130/transactions-01.txt
@@ -0,0 +1,33 @@
+cassini/home/peter/bo/2023ws/dbs/20231130> psql -h localhost -U dbs -W testdb
+Passwort:
+psql (15.5 (Debian 15.5-0+deb12u1))
+SSL-Verbindung (Protokoll: TLSv1.3, Verschlüsselungsmethode: TLS_AES_256_GCM_SHA384, Komprimierung: aus)
+Geben Sie »help« für Hilfe ein.
+
+testdb=> CREATE TABLE IF NOT EXISTS customer VALUES(id PRIMARY KEY AUTO_INCEMENR, lastname TEXT, firstname TEXT, account TEXT);
+FEHLER: Syntaxfehler bei »VALUES«
+ZEILE 1: CREATE TABLE IF NOT EXISTS customer VALUES(id PRIMARY KEY AU...
+ ^
+testdb=> CREATE TABLE IF NOT EXISTS customer VALUES(id AUTO_INCEMENR, lastname TEXT, firstname TEXT, account TEXT);
+FEHLER: Syntaxfehler bei »VALUES«
+ZEILE 1: CREATE TABLE IF NOT EXISTS customer VALUES(id AUTO_INCEMENR,...
+ ^
+testdb=> CREATE TABLE IF NOT EXISTS customer VALUES(id AUTO_INCREMENT, lastname TEXT, firstname TEXT, account TEXT);
+FEHLER: Syntaxfehler bei »VALUES«
+ZEILE 1: CREATE TABLE IF NOT EXISTS customer VALUES(id AUTO_INCREMENT...
+ ^
+testdb=> CREATE TABLE IF NOT EXISTS customer VALUES(id PRIMARY KEY AUTO_INCREMENT, lastname TEXT, firstname TEXT, account TEXT);
+FEHLER: Syntaxfehler bei »VALUES«
+ZEILE 1: CREATE TABLE IF NOT EXISTS customer VALUES(id PRIMARY KEY AU...
+ ^
+testdb=> CREATE TABLE IF NOT EXISTS customer (id PRIMARY KEY AUTO_INCREMENT, lastname TEXT, firstname TEXT, account TEXT);
+FEHLER: Syntaxfehler bei »PRIMARY«
+ZEILE 1: CREATE TABLE IF NOT EXISTS customer (id PRIMARY KEY AUTO_INC...
+ ^
+testdb=> CREATE TABLE IF NOT EXISTS customer (id INTEGER PRIMARY KEY AUTO_INCREMENT, lastname TEXT, firstname TEXT, account TEXT);
+FEHLER: Syntaxfehler bei »AUTO_INCREMENT«
+ZEILE 1: ...LE IF NOT EXISTS customer (id INTEGER PRIMARY KEY AUTO_INCRE...
+ ^
+testdb=> CREATE TABLE IF NOT EXISTS customer (id SERIAL PRIMARY KEY, lastname TEXT, firstname TEXT, account TEXT);
+CREATE TABLE
+testdb=>
diff --git a/20231130/transactions-02.txt b/20231130/transactions-02.txt
new file mode 100644
index 0000000000000000000000000000000000000000..1e3c82b9e45f6a72c28c37d9edc4f9615bf63779
--- /dev/null
+++ b/20231130/transactions-02.txt
@@ -0,0 +1,37 @@
+testdb=> ALTER TABLE customer DELETE COLUMN account;
+FEHLER: Syntaxfehler bei »DELETE«
+ZEILE 1: ALTER TABLE customer DELETE COLUMN account;
+ ^
+testdb=> ALTER TABLE customer DROP COLUMN account;
+ALTER TABLE
+testdb=> ALTER TABLE customer ADD COLUMN account_id INTEGER;
+ALTER TABLE
+testdb=> \d
+ Liste der Relationen
+ Schema | Name | Typ | Eigentümer
+--------+------------------+---------+------------
+ public | cd | Tabelle | dbs
+ public | cd_cd_id_seq | Sequenz | dbs
+ public | customer | Tabelle | dbs
+ public | customer_id_seq | Sequenz | dbs
+ public | interpret | Tabelle | dbs
+ public | interpret_id_seq | Sequenz | dbs
+ public | lied | Tabelle | dbs
+ public | lied_auf_cd | Sicht | dbs
+ public | test | Tabelle | dbs
+ public | tier | Tabelle | dbs
+ public | tier_id_seq | Sequenz | dbs
+(11 Zeilen)
+
+testdb=> \d customer
+ Tabelle »public.customer«
+ Spalte | Typ | Sortierfolge | NULL erlaubt? | Vorgabewert
+------------+---------+--------------+---------------+--------------------------------------
+ id | integer | | not null | nextval('customer_id_seq'::regclass)
+ lastname | text | | |
+ firstname | text | | |
+ account_id | integer | | |
+Indexe:
+ "customer_pkey" PRIMARY KEY, btree (id)
+
+testdb=>
diff --git a/20231130/transactions-03.txt b/20231130/transactions-03.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4081b2bf54be65b1cfcd13cd1d754fce35ce5ca7
--- /dev/null
+++ b/20231130/transactions-03.txt
@@ -0,0 +1,28 @@
+testdb=> \d customer
+ Tabelle »public.customer«
+ Spalte | Typ | Sortierfolge | NULL erlaubt? | Vorgabewert
+------------+---------+--------------+---------------+--------------------------------------
+ id | integer | | not null | nextval('customer_id_seq'::regclass)
+ lastname | text | | |
+ firstname | text | | |
+ account_id | integer | | |
+Indexe:
+ "customer_pkey" PRIMARY KEY, btree (id)
+
+testdb=> \d account
+ Tabelle »public.account«
+ Spalte | Typ | Sortierfolge | NULL erlaubt? | Vorgabewert
+---------+---------+--------------+---------------+-------------------------------------
+ id | integer | | not null | nextval('account_id_seq'::regclass)
+ number | text | | |
+ balance | integer | | |
+Indexe:
+ "account_pkey" PRIMARY KEY, btree (id)
+
+testdb=> ALTER TABLE customer ADD CONSTRAINT customer_fkey_account_id FOREIGN KEY accoun
+
+testdb=> ALTER TABLE customer ADD CONSTRAINT customer_fkey_account_id FOREIGN KEY account_id REFER
+
+testdb=> ALTER TABLE customer ADD CONSTRAINT customer_fkey_account_id FOREIGN KEY(account_id) REFERENCES account(id);
+ALTER TABLE
+testdb=>
diff --git a/20231130/transactions-04.txt b/20231130/transactions-04.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f14d3cb16e744b0b51eacce11ceaa3f92ca79792
--- /dev/null
+++ b/20231130/transactions-04.txt
@@ -0,0 +1,35 @@
+testdb=> INSERT INTO customer (lastname, firstname, account_id) VALUES ('Mustermann', 'Erika', 1);
+FEHLER: Einfügen oder Aktualisieren in Tabelle »customer« verletzt Fremdschlüssel-Constraint »customer_fkey_account_id«
+DETAIL: Schlüssel (account_id)=(1) ist nicht in Tabelle »account« vorhanden.
+testdb=> SELECT * FROM account; id | number | balance
+----+--------+---------
+(0 Zeilen)
+
+testdb=> SELECT * FROM customer;
+ id | lastname | firstname | account_id
+----+----------+-----------+------------
+(0 Zeilen)
+
+testdb=> INSERT INTO account (number, balance) VALUES ('DE12 3456 7890 ABCD EFGH IJ', 0);
+INSERT 0 1
+testdb=> SELECT * FROM account;
+ id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 0
+(1 Zeile)
+
+testdb=> INSERT INTO customer (lastname, firstname, account_id) VALUES ('Mustermann', 'Erika', 1);
+INSERT 0 1
+testdb=> SELECT * FROM customer;
+ id | lastname | firstname | account_id
+----+------------+-----------+------------
+ 2 | Mustermann | Erika | 1
+(1 Zeile)
+
+testdb=> SELECT * FROM account;
+ id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 0
+(1 Zeile)
+
+testdb=>
diff --git a/20231130/transactions-05.txt b/20231130/transactions-05.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce4d61e98c839f8f7fbd29d04a727416ea0534e3
--- /dev/null
+++ b/20231130/transactions-05.txt
@@ -0,0 +1,15 @@
+testdb=> UPDATE customer SET balance = 5000000 WHERE lastname = 'Rich';
+FEHLER: Spalte »balance« von Relation »customer« existiert nicht
+ZEILE 1: UPDATE customer SET balance = 5000000 WHERE lastname = 'Rich...
+ ^
+testdb=> UPDATE account SET balance = 5000000 WHERE lastname = 'Rich';
+FEHLER: Spalte »lastname« existiert nicht
+ZEILE 1: UPDATE account SET balance = 5000000 WHERE lastname = 'Rich'...
+ ^
+testdb=> UPDATE account SET balance = 5000000 WHERE (SELECT account_id FROM customer WHERE lastname = 'Rich');
+FEHLER: Argument von WHERE muss Typ boolean haben, nicht Typ integer
+ZEILE 1: UPDATE account SET balance = 5000000 WHERE (SELECT account_i...
+ ^
+testdb=> UPDATE account SET balance = 5000000 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Rich');
+UPDATE 1
+testdb=>
diff --git a/20231130/transactions-06.txt b/20231130/transactions-06.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bd01808a61dc47d4dbb0290ecfcc67ef48a0e926
--- /dev/null
+++ b/20231130/transactions-06.txt
@@ -0,0 +1,19 @@
+testdb=> UPDATE customer SET balance = 5000000 WHERE lastname = 'Rich';
+FEHLER: Spalte »balance« von Relation »customer« existiert nicht
+ZEILE 1: UPDATE customer SET balance = 5000000 WHERE lastname = 'Rich...
+ ^
+testdb=> UPDATE account SET balance = 5000000 WHERE lastname = 'Rich';
+FEHLER: Spalte »lastname« existiert nicht
+ZEILE 1: UPDATE account SET balance = 5000000 WHERE lastname = 'Rich'...
+ ^
+testdb=> UPDATE account SET balance = 5000000 WHERE (SELECT account_id FROM customer WHERE lastname = 'Rich');
+FEHLER: Argument von WHERE muss Typ boolean haben, nicht Typ integer
+ZEILE 1: UPDATE account SET balance = 5000000 WHERE (SELECT account_i...
+ ^
+testdb=> UPDATE account SET balance = 5000000 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Rich');
+UPDATE 1
+testdb=> UPDATE account JOIN customer ON customer.account_id = account.id SET account.balance = 5000001 WHERE customer.lastname = 'Rich';
+FEHLER: Syntaxfehler bei »JOIN«
+ZEILE 1: UPDATE account JOIN customer ON customer.account_id = accoun...
+ ^
+testdb=>
diff --git a/20231130/transactions-07.txt b/20231130/transactions-07.txt
new file mode 100644
index 0000000000000000000000000000000000000000..954568e9767eacc7512ddc9e0b9fa45eaa038020
--- /dev/null
+++ b/20231130/transactions-07.txt
@@ -0,0 +1,31 @@
+testdb=> SELECT * FROM customer;
+ id | lastname | firstname | account_id
+----+------------+-----------+------------
+ 2 | Mustermann | Erika | 1
+ 4 | Rich | Richie | 2
+(2 Zeilen)
+
+testdb=> SELECT * FROM account;
+ id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 0
+ 2 | DE98 7654 3210 ABCD EFGH IJ | 5000000
+(2 Zeilen)
+
+testdb=> UPDATE account SET balance = balance + 1000000 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Mustermann');
+UPDATE 1
+testdb=> UPDATE account SET balance = balance - 1000000 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Rich');
+UPDATE 1
+testdb=> SELECT * FROM customer; id | lastname | firstname | account_id
+----+------------+-----------+------------
+ 2 | Mustermann | Erika | 1
+ 4 | Rich | Richie | 2
+(2 Zeilen)
+
+testdb=> SELECT * FROM account; id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 1000000
+ 2 | DE98 7654 3210 ABCD EFGH IJ | 4000000
+(2 Zeilen)
+
+testdb=>
diff --git a/20231130/transactions-08.txt b/20231130/transactions-08.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4c5995e636d998eb5b0ba1ad63f960a1b4aa8678
--- /dev/null
+++ b/20231130/transactions-08.txt
@@ -0,0 +1,21 @@
+testdb=> BEGIN;
+BEGIN
+testdb=*> UPDATE account SET balance = balance + 1 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Mustermann');
+UPDATE 1
+testdb=*> UPDATE account SET balance = balance - 1 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Rich');
+UPDATE 1
+testdb=*> SELECT * FROM customer; id | lastname | firstname | account_id
+----+------------+-----------+------------
+ 2 | Mustermann | Erika | 1
+ 4 | Rich | Richie | 2
+(2 Zeilen)
+
+testdb=*> SELECT * FROM account; id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 1000001
+ 2 | DE98 7654 3210 ABCD EFGH IJ | 3999999
+(2 Zeilen)
+
+testdb=*> COMMIT;
+COMMIT
+testdb=>
diff --git a/20231130/transactions-09.txt b/20231130/transactions-09.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5f0e8c07534be6488fb9d2ef8d1f43ec4177f2dc
--- /dev/null
+++ b/20231130/transactions-09.txt
@@ -0,0 +1,34 @@
+testdb=> BEGIN; BEGIN
+testdb=*> UPDATE account SET balance = balance + 10000000 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Mustermann');
+UPDATE 1
+testdb=*> UPDATE account SET balance = balance - 10000000 WHERE id = (SELECT account_id FROM customer WHERE lastname = 'Rich');
+UPDATE 1
+testdb=*> SELECT * FROM customer; id | lastname | firstname | account_id
+----+------------+-----------+------------
+ 2 | Mustermann | Erika | 1
+ 4 | Rich | Richie | 2
+(2 Zeilen)
+
+testdb=*> SELECT * FROM account; id | number | balance
+----+-----------------------------+----------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 11000001
+ 2 | DE98 7654 3210 ABCD EFGH IJ | -6000001
+(2 Zeilen)
+
+testdb=*> ROLLBACK;
+ROLLBACK
+testdb=> SELECT * FROM customer;
+ id | lastname | firstname | account_id
+----+------------+-----------+------------
+ 2 | Mustermann | Erika | 1
+ 4 | Rich | Richie | 2
+(2 Zeilen)
+
+testdb=> SELECT * FROM account;
+ id | number | balance
+----+-----------------------------+---------
+ 1 | DE12 3456 7890 ABCD EFGH IJ | 1000001
+ 2 | DE98 7654 3210 ABCD EFGH IJ | 3999999
+(2 Zeilen)
+
+testdb=>