MySql How Return All Items Which Contain All Selected Features

MySql How Return All Items Which Contain All Selected Features

Using mysql, I'm trying to return all items which contain all selected features.

assigned_features

feature_id      |   item_id
-----------------------------------------------
1               |   1
2               |   1
3               |   1
1               |   2
2               |   2
1               |   3

Using mysql, I'm trying to return all items which contain all selected features.

For example, I wish to return items where feature_id = 1 and 2. This should return item_id 1 and 2.

Alternatively, if I only wish to retrieve items where feature_id = 1,2 and 3, the result should yield item 1.

I don't really know where to begin.

Thank you!

sql mysql database

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