Suggestion for coding SQL

I would suggest that a best practice for coding SQL, in the FROM  statement is to always use "database.table", instead of utilizing the "USE" command every time so that SQL knows what database you are referencing. In a corporate environment, you may be referencing the same table name under different databases. We had different databases for each product line with the same (or similar) table structures). SQL for one product line may not be the same for each product line. So I believe a best practice is always to reference the "database.table" combination.