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    How to add variables without adding cases, SPSS25

    I have 2 datasets. Dataset 1 is the main file with 13000 cases (identified with the variable “id”. Dataset 2 is the supplier file with 13400 cases and 2 variables (“id” and variable “X”). 13000 of the cases are identical to those in Dataset 1 (have the same id). 400 cases are only included in...