27 lines
535 B
Markdown
27 lines
535 B
Markdown
### SELECT
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```
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SELECT MatrNr, Name, Semester from Student
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```
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Spalte umbenennen
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`SELECT MatrNr AS InsassenNr from Student`
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Keine Duplikate
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`SELECT DISTINCT Semester AS Jahrgänge from Student`
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### WHERE
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```
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SELECT * from Student WHERE Semester = 2
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---
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SELECT * from Student s WHERE s.Semester = 2 AND s.Name='Byleth'
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```
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#### Anatomie einer WHERE Klausel
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Vergleichsoperatoren: <,>,=,<=,>=,<>
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BETWEEN
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LIKE
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IS NULL / IS NOT NULL
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AND, OR, NOT
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+,-,\*,/
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IN, NOT IN, $\theta$ ANY, $\theta$ ALL, EXISTS mit $\theta$ = Vergleichsoperator |