Relation Join

rascal-0.40.17

Synopsis

Join two relation values.

Syntax

Exp₁ join Exp₂

Types

Exp₁	Exp₂	Exp₁ join Exp₂
rel[ T₁₁, T₁₂, T₁₃, ... ]	rel[ T₂₁, T₂₂, T₂₃, ... ]	rel[ T₁₁, T₁₂, T₁₃, ..., T₂₁, T₂₂, T₂₃, ... ]

Description

Relation resulting from the natural join of the relation values of the two arguments. This relation contains tuples that are the result from concatenating the elements from both arguments.

Examples

rascal>{<1,2>, <10,20>} join {<2,3>};
rel[int,int,int,int]: {
  <1,2,2,3>,
  <10,20,2,3>
}
rascal>{<1,2>} join {3, 4};
rel[int,int,int]: {
  <1,2,3>,
  <1,2,4>
}
rascal>{<1,2>, <10,20>} join {<2,3>, <20,30>};
rel[int,int,int,int]: {
  <1,2,2,3>,
  <10,20,2,3>,
  <10,20,20,30>,
  <1,2,20,30>
}