It’s a very rate feat. The last ones who did it were:
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Tim Duncan (1998)
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David Robinson (1990)
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Michael Jordan (1985)
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Larry Bird (1980)
Kareem and Wilt also did it. It was a bit more common in the past because players would usually spent 3-4 years in college before entering the NBA.
Yoy don’t even know that the last player who did it was Blake Girffin and just go on trying to hype Chet. Chet is awesome, don’t get me wrong, but there are other players deserving to be all-star ahead of him. All NBA team seems almost impossible.
Edit: These are Blake’s stats at the All-star break:
22.8p / 12.6r / 3.5a
You don’t even know that Blake Griffin didn‘t do it
https://www.basketball-reference.com/players/g/griffbl01.html
Basic research. You don’t have to thank.