add task two of today
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SELECT book.bibNr, book.titel, COUNT(book.bibNr) AS ausleihAnzahl
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FROM buch as book
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LEFT JOIN Ausleihe as rent ON book.bibNr = rent.bibNr
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AND YEAR(rent.ausleihdatum) = 2015
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GROUP BY book.bibNr, book.titel
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ORDER BY ausleihAnzahl ASC
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SELECT ProductID, SUM(Quantity) AS orderAnzahl
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FROM OrderDetails
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GROUP BY ProductID
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ORDER BY orderAnzahl ASC;
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47
Zweites Jahr/aufgaben/saveLibaryDataInXml/task.md
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47
Zweites Jahr/aufgaben/saveLibaryDataInXml/task.md
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# 2.2 XML
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## 2.2.1
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- Namen sind klar und deutlich
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- inhaltlich korrekt geordnet
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## 2.2.2
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````xml
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<?xml version="1.0" encoding="utf-8"?>
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<data>
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<buch>
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<bibNr> </bibNr>
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<title> </title>
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<zustand> </zustand>
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<seitenanzahl> </seitenanzahl>
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</buch>
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<avmedium>
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<bibNr> </bibNr>
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<title> </title>
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<zustand> </zustand>
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<dauer> </dauer>
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</avmedium>
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</data>
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````
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### 2.3 SQL
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## 2.3.1
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```sql
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SELECT book.bibNr, book.titel, COUNT(book.bibNr) AS wieOftAusgeliehen
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FROM buch AS book
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LEFT JOIN Ausleihe AS rent ON book.bibNr = rent.bibNr
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AND YEAR(rent.ausleihdatum) = 2015
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GROUP BY book.bibNr, book.titel
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ORDER BY wieOftAusgeliehen ASC
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```
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## 2.3.2
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X
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## 2.3.3
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Gute Frage, frag chatgpt!
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