April 2016
Intermediate to advanced
604 pages
25h 38m
English
book
Analyzing and Securing Social Networks
by Bhavani Thuraisingham, Satyen Abrol, Raymond Heatherly, Murat Kantarcioglu, Vaibhav Khadilkar, Latifur Khan
Content preview from Analyzing and Securing Social Networks
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322 Analyzing and Securing Social Networks
25.5.5 Breaking ties By summary statistics
We frequently face situations where we need to choose a join for multiple join options. These choices
can occur when both query plans (i.e., join orderings) require the minimum number of jobs. For
example, the query shown in Listing 6 poses such a situation.
Listing 6. Query Having a Tie Situation
?X rdf:type ub:FullProfessor
?X ub:advisorOf ?Y
?Y rdf:type ub:ResearchAssistant
The second TP in the query makes it impossible to answer and solve the query with only one job.
There are only two possible plans: we can join the rst two TPs on X rst and then join its output
with the last TP on Y, or we can join the last two patterns rst on Y and then join its out
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