user views of relational dbms开题资料.pdf

文档介绍：any user system would need IC sup-
port to create suitable DLil copies or
Userviews of relational ‘special’ databases (DBs). Also, any
query system would need to use
DBMS subsets of Trebor’s master DBs to
avoid runaway processing overheads
by MARLENE BROWN (the source DBs total some 7MB), and
for SQLiDS to be useable by ‘general’
users, IC support would be needed to
n the late 1970s when relational computing. In this process, data has create views of the main tables as
Idatabase management systems to be ‘given back’ to users throughout
required.
(DBMS) first became widely dis- Europe and users have to hav