[DMDB] SQL intro (DML, DDL)

semester4/dmdb/code/sql/ddl/alter.sql

@@ -0,0 +1,3 @@
+ALTER TABLE TableName ADD COLUMN (col integer);
+ALTER TABLE TableName ADD COLUMN (AnotherColumn integer default "");
+ALTER TABLE TableName DROP COLUMN AnotherColumn;

semester4/dmdb/code/sql/ddl/create.sql

@@ -1,6 +1,6 @@
 CREATE TABLE TableName (
     Attribute integer,
     OtherAttribute varchar (30),
-    NextAttribute character (2) default "AP",
+    NextAttribute character (2) default "AP", -- default value, if unset on insert
-    PRIMARY KEY (Attribute)
+    PRIMARY KEY (Attribute) -- primary key, as in RA
 );

semester4/dmdb/code/sql/ddl/delete.sql

@@ -0,0 +1 @@
+DROP TABLE TableName;

semester4/dmdb/code/sql/dml.sql

@@ -0,0 +1,11 @@
+INSERT INTO TableName (
+    Attribute,
+    OtherAttribute
+) VALUES ( 1000, 'Value' );
+
+DELETE FROM TableName WHERE Attribute > 50;
+
+UPDATE TableName SET Attribute = Attribute + 1;
+
+-- Import data from a CSV file (this is pgsql specific syntax)
+COPY TableName FROM '/data.csv' WITH FORMAT csv;

semester4/dmdb/parts/01_sql/00_intro.tex

@@ -5,5 +5,9 @@ people deviate from it and new standards form.
 
 Even though \textit{most} \acrshort{sql} databases support the standard SQL operations, many have added a lot of features on top.
 
-\sql\ is split up into the query language itself, used to operate on data, as well as the Data Definition Language,
+\sql\ is split up into the following parts:
-used to create, modify and delete schemas.
+\begin{itemize}
+\item Data Definition Language, used to create, modify and delete schemas.
+\item Data Manipulation Language, used to insert, update and delete data
+\item Query Language, used to retrieve data
+\end{itemize}

semester4/dmdb/parts/01_sql/01_ddl.tex

@@ -4,7 +4,7 @@ For that, we provide a table name, the columns and their data types.
 
 \sql\ supports the following data types (plus more):
 \begin{multicols}{2}
-    \begin{itemize}[itemsep=-2pt]
+	\begin{itemize}[itemsep=-2pt]
 		\item \texttt{char(n)}
 		\item \texttt{varchar(n)}
 		\item \texttt{integer}
@@ -16,15 +16,21 @@ For that, we provide a table name, the columns and their data types.
 
 \subsubsection{Creating Tables}
 Use the DDL \texttt{CREATE TABLE} keyword to create a table. We can set default values for certain attributes,
-or can add constraints to them
+or can add constraints to them.
 
 % TODO: Constraints (such as NOT NULL)
 
 \inputcodewithfilename{sql}{}{code/sql/ddl/create.sql}
 
 
-
+% TODO: Make sure all the sql statements actually execute in pgsql
 \subsubsection{Updating / Altering Tables}
+Use the DDL \texttt{ALTER TABLE} keyword to update a table's schema.
+Be aware that if we ADD a column to the schema, unless a default value is provided, the column is set to \texttt{NULL} (see \ref{sec:sql-null})
+
+\inputcodewithfilename{sql}{}{code/sql/ddl/alter.sql}
 
 
 \subsubsection{Deleting Tables}
+
+\inputcodewithfilename{sql}{}{code/sql/ddl/delete.sql}

semester4/dmdb/parts/01_sql/02_dml.tex

@@ -0,0 +1,8 @@
+\newpage
+\subsection{Data Manipulation Language (DML)}
+The DML is used to insert, update and delete data from the database.
+
+Below some examples showing the use of the common operations.
+Note that you can use a \texttt{WHERE} clause from the query language to filter data for both \texttt{DELETE} and \texttt{UPDATE} statements.
+
+\inputcodewithfilename{sql}{}{code/sql/dml.sql}

semester4/dmdb/parts/01_sql/main.tex

@@ -2,5 +2,6 @@
 \section{SQL}
 \input{parts/01_sql/00_intro.tex}
 \input{parts/01_sql/01_ddl.tex}
+\input{parts/01_sql/02_dml.tex}
 \input{parts/01_sql/01_operations.tex}
 % \input{parts/00_sql/}

semester4/dmdb/postgres-language-server.jsonc

@@ -0,0 +1,17 @@
+{
+    "$schema": "https://pg-language-server.com/latest/schema.json",
+    "vcs": {
+        "enabled": false,
+        "clientKind": "git",
+        "useIgnoreFile": false
+    },
+    "files": {
+        "ignore": []
+    },
+    "linter": {
+        "enabled": true,
+        "rules": {
+            "recommended": true
+        }
+    }
+}