CRM Web API PATCH Question About Select Statement (can you use select statement to PATCH)

Hello, All.

From searching online and getting many results from this forum, I noticed all code examples for PATCH or PUT never uses the select statement.

I always see something like the below, always referring to an exact record using it's GUID:

req.open("PATCH", serverURL + "/api/data/v8.2/accounts(" + GUId + ")"

I usually retrieve information from custom entity, so I am familiar with using select statements:

req.open("GET", srverURL + "/api/data/v8.2/customexamples?$select=col1,col2,col3&$filter=customfiledid='HR00001'", true);

So my questions:
-Can I PATCH using a select statement?
-Or do I have to do two requests? A GET request to retrieve the GUID of that record, then do a PATCH request using that GUID I just retrieved?

Thanks in advance.