NOTE: Need only Relational algebra expression

a) select rackets

from Qaza where NAME="A";

b) SELECT COUNT (name) from female where question1=Null

c) SELECT Count(SALAH)From SALAHWHERE follow=false

d) select AVG(time)from prayer where name ="M.Noman"

e) SELECT namefrom slalah where repetation=max

f) select name from salah where repetation