Percentage Aggregation Functions by Extending SQL.

Jie Xiao Yan Zhu JinLing Luo FenShi Zeng

Published in: J. Softw. (2012)

Keyphrases

aggregation functions
aggregate functions
query language
aggregate queries
relational databases
sql queries
databases
recursive queries
expressive power
database
database design
relational algebra
transitive closure
data types
data model
relational model
database queries
database theory