var sidebar_align = 'right';
var content_container_margin = parseInt('290px');
var sidebar_width = parseInt('270px');
aggregate function in relational algebra
Hi, does anybody know how to express a relational algebra without using aggregate function for this kind of question:
find the most expensive CD in the CD entity
CD(CdNum, Title, price, year)
thanks in advance!
Is this some sort of test question?
from CD CDMain
left outer join CD CDSub on CDMain.price < CDSub.price
where CDSub.CdNum is null