FROM (SELECT * FROM cityyearportco WHERE statecode='VT' AND year='2018') AS A
LEFT JOIN portcogeo AS B ON A.coname=B.coname AND A.statecode=B.statecode AND
A.datefirstinv=B.datefirstinv WHERE latitude IS NOT NULL; Note that there should be no semi-colon! Then right click and Display XY data. Add coordinate system: World WGD 1984.
Then Add Data (Yellow Diamond with Black Plus) dropdown -> Add Baselayer -> light grey