Which of the following is not typical of OLAP processing?$1.$complex queries$2.$data that is being updated frequently$3.$calculations that access a large fraction of the data, including historic data$4.$some staleness is acceptable

Q$14$:Suppose that a table R has been declared so that column C is UNIQUE. Which of the following statements is true$1.$C is the PRIMARY KEY for the table$2.$whenever two rows have the same contents for column C$,$ both must be NULL$3.$the rows of R are arranged in increasing order of column C $4.$at most one row of column C can have the value NULL

Q$15$:Suppose that in a relation RA$,$ B$,$ C$,$ D$)$ and AB C$.$ Which of the following is also valid?$1.$C $->$ AB $2.$C$->$ AD $3.$A $->$ CD $4.$ABD $->$ CD