Hi heffo, First, thanks for you reply. I'm a very beginner , hope can learn more from you. I have save my two table in type SAS data set in my local pc (shown in screenshot attached), i have tried your method, but it keep saying: ERROR: File WORK.POLA_CLM_AGG_201811.DATA does not exist. ERROR: File WORK.POLA_CLM_MTH_201812.DATA does not exist. Here's my code using your method data Table3; set pola_clm_agg_201811 pola_clm_mth_201812; run; I did not run any code before these code. I type this in new SAS program. Is this means that i need to import the two SAS data set table before i combine them?
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