Problem 1: T/F (20 points) 1. SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions. 2. For a relation schema R (A, B, C, D), if AB -> C and C -> D, then AB is a key. 3. The minimum select statement consists of 3 clauses. 4. In a nested query, the execution starts from the outer query then into the inner ones. 5. Aliases can be specified in query using the keyword As in the select clause or in the from clause. 6. If A->B is a hidden functional dependency then B is a portion of the primary key. 7. A good practice of the DB design process is to normalize relations before the ER designing 8. The SQL UPDATE operation changes the table structure while leaving the data intact. 9. Having is used to place a constraint on aggregated properties. 10.In the GROUP BY clause, we can put only one attribute