I need SQL code to solve the tables combination problem, described on below: Table old data: table old
..or do I have to give P.nk <- factorial(n) / factorial(n-k) or P.nk <- ch开发者_StackOverflow中文版oose(n,k) * factorial(k)
to become more specific, here is an example: > expand.grid(5, 5, c(1:4,6),c(1:4,6)) Var1 Var2 Var3 Var4
This question already has answers here: Closed 12 years ago. Possible Duplicate: Howto create combinations of several vectors without hardcoding loops in C++?
In cases where order does matter, it\'s rather easy to generate the matrix of all possible outcomes. One way for doing this is using expand.grid as shown here.
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