Using Fully Qualified Table Names
The SQL examples used thus far have referred to columns by just the column names. Referring to columns using fully qualified names (using both the table and column names) is also possible. Look at this example:
SELECT products.prod_name FROM products;
This SQL statement is functionally identical to the first one used in this lesson, but here a fully qualified column name is specified.
Table names, too, may be fully qualified, as shown here:
SELECT products.prod_name FROM crashcourse.products;
Once again, this statement is functionally identical to the one just used (assuming, of course, that the products table is indeed in the crashcourse database).
Situations exist where fully qualified names are required, as we will see in later lessons. For now, it is worth noting this syntax so you’ll know what it is if you run across it.