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relations and fields can be renamed in relational algebra using the renaming operator

(a) ρ

(b) σ

(c) ∅

(d)  ⟕

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@mohit+jain

 

(a)  ρ ….

 

Name         Symbol     Operation in relational algebra

 

rho                   ρ           Rename

Sigma              σ          Selection

theta                 θ         No operation

left outer join  ⟕          left outer join

 

 

Explanation:

ρA/B(R) → Rename attribute name B of relation R to a attribute A …

 

 

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