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R function: expand.grid
expand.grid creates the cartesian product of factors. In SQL, that would be a cross join.
a <- c( 1, 2, 3)
b <- c( 4, 5, 6)
c <- c( 7, 8, 9)
expand.grid(a, b, c)
# Var1 Var2 Var3
# 1 1 4 7
# 2 2 4 7
# 3 3 4 7
# 4 1 5 7
# 5 2 5 7
# 6 3 5 7
# 7 1 6 7
# 8 2 6 7
# 9 3 6 7
# 10 1 4 8
# 11 2 4 8
# 12 3 4 8
# 13 1 5 8
# 14 2 5 8
# 15 3 5 8
# 16 1 6 8
# 17 2 6 8
# 18 3 6 8
# 19 1 4 9
# 20 2 4 9
# 21 3 4 9
# 22 1 5 9
# 23 2 5 9
# 24 3 5 9
# 25 1 6 9
# 26 2 6 9
# 27 3 6 9
typeof(expand.grid(a, b, c))
# [1] "list"
cat("\n\n")
expand.grid(col_1 = 1:2, col_2 = c('Foo', 'Bar', 'Baz'))
# col_1 col_2
# 1 1 Foo
# 2 2 Foo
# 3 1 Bar
# 4 2 Bar
# 5 1 Baz
# 6 2 Baz