Deleting duplicate observations from a dataset

I have a large dataset and I want to delete duplicate observations. I do not want to use the function unique because it compares all values of the variables and it is slow. I just want to use the variable PostID of the observations and delete duplicates. I attach a fraction of the dataset. Thank you for your help.

Answer 1

[Walter Roberson]

unique(pieceDB, 'postID')

Answer 2

[Sebastiano delre]

Wowwww, much easier than I expected. Thanks much!