'In the restaurant' would be inside the restaurant.
'At the restaurant' could be inside it, or it could be outside but close to it.
You are at the location, but not necessarily inside it (though you could be).
6 Temmuz 2020
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Either or both could be correct depending on the context; do you have a sentence in mind?
6 Temmuz 2020
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at the restaurent
6 Temmuz 2020
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!