Trouble comparing colomns from different datasets

Hi Everyone,

I have problem with comparing my datasets. I want to select two coloms from different datasets to see which numbers overlap in the coloms, but they are different lenghts so I get an error.

Error in data.frame(HbA1cDM, Diabetestype2[HbA1cDM$studie ID == Diabetestype2$DataAdriaan.ID, :
arguments imply differing number of rows: 36, 0
In addition: Warning message:
In HbA1cDM$studie ID == Diabetestype2$DataAdriaan.ID :
longer object length is not a multiple of shorter object length

Does anyone know how I can solve that problem?

Thank you in advance!

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