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Projection (relational algebra)
In relational algebra, a projection is a unary operation written as Π a 1 , . . . , a n ( R ) {\displaystyle \Pi _{a_{1},...,a_{n}}(R)} , where R {\displaystyle R} is a relation and a 1 , . . . , a n {\displaystyle a_{1},...,a_{n}} are attribute names. Its result is defined as the set obtained when the components of the tuples in R {\displaystyle R} are…
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