Hi,
It is not possible to select columns when creating a "SQL Table" dataset.
You can create a "SQL Query" dataset instead. An important note is that a SQL Query dataset cannot benefit from the "In-database" engine for visual recipes, and cannot be used as input for a SQL recipe (basically, you should almost only use it as input of a prepare recipe).
See https://doc.dataiku.com/dss/latest/connecting/sql_datasets.html for more information