CODEWITHSUNDEEP
relational-algebra
Mat.S
Mat.S

Reputation: 1854

What Cannot be Expressed by Relational Algebra?

What are some queries that cannot be expressed by the basic operations of relational algebra?

What I know so far are that aggregate functions like average, total number cannot be expressed? What others are there?

Upvotes: 1

Views: 1634

Answers (1)

Erwin Smout
Erwin Smout

Reputation: 18408

Any query for which [generalized] transitive closure is required.

Is there a flight path from Capetown to Wellington ? How long will a train ride from London to Sofia take, how many times will I have to change trains and how long will I be kept waiting in the train station ?

Upvotes: 2

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