vault backup: 2026-07-22 18:29:47
This commit is contained in:
Vendored
+17
-18
@@ -67,9 +67,19 @@
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"icon": "lucide-file-text",
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"title": "3-Rel"
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@@ -199,24 +209,13 @@
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"icon": "lucide-archive",
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"title": "Alle Eigenschaften"
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@@ -233,6 +232,10 @@
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Relationaler Kalkül.md",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Anhänge/Pasted image 20260722182741.png",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Relationales Datenmodell.md",
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@@ -242,11 +245,7 @@
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Anhänge/Pasted image 20260722181643.png",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Anhänge/Pasted image 20260722181636.png",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Anhänge/Pasted image 20260722181240.png",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Anhänge/Pasted image 20260722181151.png",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Anhänge/Pasted image 20260722181126.png",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Anhänge/Pasted image 20260722181003.png",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Relationale Algebra.md",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/ER-Modell zu Relationalem Modell.md",
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"SS2026/Datenbanken und Informationssysteme/Relationales Datenmodell/Intrarelationale Abhängigkeiten.md",
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"SS2026/Klausurplan.canvas",
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+38
@@ -0,0 +1,38 @@
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Beschreibt, WAS das Ergebnis erfüllen muss.
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### Tupelkalkül
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Ergebnis enthält Tupel t für die F(t) wahr ist.
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![[Pasted image 20260722181003.png]]
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Existenzquantor:
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![[Pasted image 20260722181126.png]]
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Allquantor:
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![[Pasted image 20260722181151.png]]
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Ergebnisschema kann neue Tupel konstruieren:
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![[Pasted image 20260722181240.png]]
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Tupelvariablen:
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![[Pasted image 20260722181636.png]]
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![[Pasted image 20260722181643.png]]
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![[Pasted image 20260722181649.png]]
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Semantik:
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![[Pasted image 20260722181801.png]]
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![[Pasted image 20260722181944.png]]
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![[Pasted image 20260722182103.png]]
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Ein Sicherer Ausdruck ist wenn alle Variablen an tatsächlich vorkommende Datenbankwerte
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gebunden sind.
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### Domänenkalkül
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Gleichstark wie Tupelkalkül!
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![[Pasted image 20260722182724.png]]
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![[Pasted image 20260722182741.png]]
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TRC vs. DRC
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![[Pasted image 20260722182807.png]]
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+1
-25
@@ -31,31 +31,7 @@ Referenziert einen Primärschlüssel einer anderen Tabelle
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[[Relationale Algebra]]
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## Relationaler Kalkül
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Beschreibt, WAS das Ergebnis erfüllen muss.
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### Tupelkalkül
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Ergebnis enthält Tupel t für die F(t) wahr ist.
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![[Pasted image 20260722181003.png]]
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Existenzquantor:
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![[Pasted image 20260722181126.png]]
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Allquantor:
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![[Pasted image 20260722181151.png]]
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Ergebnisschema kann neue Tupel konstruieren:
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![[Pasted image 20260722181240.png]]
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Tupelvariablen:
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![[Pasted image 20260722181636.png]]
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![[Pasted image 20260722181643.png]]
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![[Pasted image 20260722181649.png]]
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Semantik:
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![[Pasted image 20260722181801.png]]
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![[Pasted image 20260722181944.png]]
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![[Pasted image 20260722182103.png]]
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[[Relationaler Kalkül]]
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