Invention Grant
- Patent Title: Stratified sampling of data in a database system
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Application No.: US10113497Application Date: 2002-04-01
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Publication No.: US07069264B2Publication Date: 2006-06-27
- Inventor: Vijayakumar Anjur , Ambuj Shatdal
- Applicant: Vijayakumar Anjur , Ambuj Shatdal
- Applicant Address: US OH Dayton
- Assignee: NCR Corp.
- Current Assignee: NCR Corp.
- Current Assignee Address: US OH Dayton
- Agency: Trop, Pruner & Hu
- Main IPC: G06F17/30
- IPC: G06F17/30
Abstract:
A stratified sampling mechanism is provided in a database system. The stratified sampling mechanism includes defining a clause in a query that indicates stratified sampling is desired. Data from a source table is stratified into different subgroups based on stratification conditions in the query. Sampling is performed within each subgroup.
Public/Granted literature
- US20020198863A1 Stratified sampling of data in a database system Public/Granted day:2002-12-26
Information query
