for the CD_DB ,  the table master info

1. what are the attributes
2. what is the schema
3. what is the relation

4.  what is   s  type /= "Metal" ( T_CD_Master)

5.  what is     p  price (T_CD_Info )

6.  what is   T_CD_Master   U  T_CD_Info

7.  what is   T_CD_Master  |><|  T_CD_Info

8.  write the set selection notation for each of the above.

SQL