Hi Koen, Thanks for your reply! I am sorry that, in my question, I forgot to describe one thing. It's that before run this proc sql, I will run the program to output 'TEST' dataset first. But the code for 'TEST' dataset didn't not change, I just rerun it. After that, I ran this proc sql, then the case of name changed. I am not sure if this is related to the code for 'TEST' dataset. But the first time I run these code, it will get the uppercase 'name'.
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