Hi,
Please Explain this query from inermost select.
Each step by stgep
I don't understand this :(
select distinct s.sname from s
where not exists
(select * from p
where not exists
(select * from spj
where SPJ.s# = s.s# and spj.p# = p.p#))
And relation is :
S(s#,sname,city)
p(p#,pname,color)
j(j#,jname,city)
SPJ(S#,p#,j#,qty)