what is a select operationthe select operation
What is a SELECT operation?
The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
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what is a primary keyprimary key is chosen by the database designer as the principal means of identifying an entity in the entity
explain feed - cutting parameters1 in cylindrical grinding feed is the longitude movement of the work piece per revolutionffeed in mm per work piece
what is a super keya super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity
define- relational algebrathe relational algebra is a procedural query language it having of a set of operations that take one or two relation as
what is a select operationthe select operation selects tuples that please a given predicate we use the lowercase letter sigma to denote
what is a project operationthe project operation is a unary operation that returns its argument relation with particular attributes left out
q is there respiratory pigment in the annelid bloodthe blood in beings of the phylum annelida contains the respiratory pigment hemoglobin the same
write short notes on tuple relational calculusthe tuple relational calculation is anon procedural query language it defines the desired information
write short notes on domain relational calculusthe domain relational calculus uses domain variables that take on values from an attribute domain
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