Consider the following relation Teacher (tech_id: integer, sal: integer, age: real, did: integer) There is a clustered index one id and an unclustered index on age. 1. How would you use the indexes to...

Consider the following relation
Teacher (tech_id: integer, sal: integer, age: real, did: integer)
There is a clustered index one id and an unclustered index on age.
1. How would you use the indexes to enforce the constraint that tech_id is a key?
2. Write a query of an update that is definitely speeded up because of the available indexes
3. Give an example of an update that is definitely slowed down because of the indexes
4. Can you give an example of an update that is neither speeded up nor slowed down by the indexes?