1a) Union compatibility is met among relations when they? a) have the same number of attributes and the same domain b)

[answerhappygod]

1a) Union compatibility is met among relations when they?
a) have the same number of attributes and the same domain
b) have the same number of attributes
c) have the same table degree
d) have compatible domains
1b) What is the before trigger?
a) trigger runs before a particular operation
b) Trigger runs before an insert, update or delete on a table
c) trigger runs after an insert, views, update or delete on a table
d) none of the above
1c) what would happen when we update a value in a view?
a) will not change the view
b) will not change the table from which it is defined
c) will change the table from which it is defined
d) none of the above