I want to get join values from two array like that of RDB


A : index array index:integer [i=0:100,1,0]
B : data array <data:float> [j=0:1000,1,0]

The index array contains ‘j index’ of the data array in its index attribute.
I want to get data values of the data array that were matched the ‘j index’.

How can I get this?

thank you in advance.