26 search results - page 1 / 6 » Improved Unnesting Algorithms for Join Aggregate SQL Queries |
VLDB
1992
ACM
13 years 8 months ago
1992
ACM
IEEECSA
2009
13 years 2 months ago
2009
- The SQL language allows users to express queries that have nested subqueries in them. Optimization of nested queries has received considerable attention over the last few years. ...
SIGMOD
2005
ACM
13 years 10 months ago
2005
ACM
One of the most powerful features of SQL is the use of nested queries. Most research work on the optimization of nested queries focuses on aggregate subqueries. However, the solut...
TKDE
2012
11 years 7 months ago
2012
—Preparing a data set for analysis is generally the most time consuming task in a data mining project, requiring many complex SQL queries, joining tables and aggregating columns....
VLDB
2005
ACM
13 years 10 months ago
2005
ACM
The largest databases in use today are so large that answering a query exactly can take minutes, hours, or even days. One way to address this problem is to make use of approximati...