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Stored size: 505 Bytes
Contents
Relational matching (join + project back on left)
SYNOPSIS
#(signature)
DESCRIPTION
This operator restricts its LEFT operand to tuples for which there exists at
least one tuple in RIGHT that (naturally) joins. This is a shortcut operator
for the following longer expression:
(project (join xxx, yyy), [xxx's attributes])
Or equivalently,
(join xxx, (project xxx, [common attributes]))
EXAMPLE
# Which suppliers supply at least one part?
!(alf matching suppliers supplies)
Version data entries
8 entries across 8 versions & 2 rubygems