If you are interested in installing all oracle database sample schemas, please refer to my post:
Installing Oracle Sample Schemas (19.3)
If you want to install the scott demo schema, please refer to:
Here is a live demo about Order Entry (OE) schema installation:
Please note that before installing the OE schema, you should first install the HR schema, otherwise you will get some errors, and not all OE objects will be created.
You can install HR schema as explained in the following post: