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09.09.2008 at 10:02PM PDT, ID: 23718090
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9.1

How do i write a division in relationship algebra into SQL ?

Asked by spiraltrip in SQL Query Syntax, SQL Server 2005

Tags: , , ,

Division in Relation Algebra displays a set of tuples in R that match every tuple in S (over some attributes) but how do write that in SQL? (T-SQL please)

Lets say :

R / S

Relation R
Student |       Course
Fred        Course01
Fred             Course02
Fred             Course03
Eugene      Course01
Eugene      Course02
Sara        Course01
Sara              Course02

Relation S
Course01
Course02

Ans :
Student who take BOTH Course01and Course02
Fred
Sara

How do i write that in SQL , Im sure someone knows ...

I tried this but doesn work (All seems to work only with numerics)
Select student from R WHERE course = ALL (select course from S)Start Free Trial
 
Keywords: How do i write a division in relationship…
Title
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5 Fred
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[+][-]09.09.2008 at 10:08PM PDT, ID: 22435134

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[+][-]09.09.2008 at 11:48PM PDT, ID: 22435651

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[+][-]09.10.2008 at 12:02AM PDT, ID: 22435724

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About this solution

Zones: SQL Query Syntax, SQL Server 2005
Tags: Microsoft, SQL, SQL 2005, Relationship Alegbra
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Solution Provided By: dqmq
Participating Experts: 2
Solution Grade: B
 
 
[+][-]09.10.2008 at 12:17AM PDT, ID: 22435842

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[+][-]09.10.2008 at 12:20AM PDT, ID: 22435862

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[+][-]09.10.2008 at 12:35AM PDT, ID: 22435974

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[+][-]09.10.2008 at 10:22PM PDT, ID: 22446511

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