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WorksheetsRelational Algebra
Total questions: 4
Worksheet time: 7mins
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Worksheetsאלו מהסימונים הבאים מייצגים פעולות באלגברה רלציונית?
אם בטבלה 1 יש 2 שדות ובטבלה 2 יש 3 שדות כמה שדות יהיו במכפלה הקרטזית
3
2
5
4
6
According to the formal definition of RA, what is a basic expression?
Database relation
Constant relation
Pi / Sigma / Ro / etc...
A natural number
In RA What does the selection operation do?
Choose the fields to present in the results
Choose the records to present in the result
Select fields that satisfy a given condition
Project records smaller/larger than a number X
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