st: find the corresponding values between two variables

[Sara Neto Machado <mail@saramachado.com>]

Dear all,

c_est----w_est---c_trab----w_trab
10----------10-----------10-------11
11-----------3------------11-------3
13-----------4-------------17-------5
17------------5-------------18-------7
18---------10----------------23-----3
23-----------5----------------25-----6

my aim is to perform the differences between w_est and w_trab for the
same values of c_est and c_trab. However, I have along the dataset as
well as values that do not coincide in c_trab and c_est (Eg from the
sample: 13) that "ruins" the sorting between those columms. I want the
13 to appear like missing values on the same line of c_trab. I am
trying to search any syntax that suits my purpose and nothing relevant
came up. Maybe there are other alternatives that I am not seeing now..

Can anyone help me? much appreciated!

regards,
Sara
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