发明名称 |
Systems and methods for estimating the number of unique attribute values in a database |
摘要 |
Systems and methods for estimating the number of unique attributes in a database are disclosed that can include generating a first estimate of the unique values of an attribute using a data sample; generating a second estimate of the unique values of the attribute in the data sample; forming a weighted first estimate; forming a weighted second estimate; and combining the weighted first and second estimates to form a final estimate.
|
申请公布号 |
US7428550(B2) |
申请公布日期 |
2008.09.23 |
申请号 |
US20040928408 |
申请日期 |
2004.08.27 |
申请人 |
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. |
发明人 |
LAKSHMINARAYAN CHOUDUR;HEYTENS MICHAEL |
分类号 |
G06F17/00 |
主分类号 |
G06F17/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|