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Stratified sampling of data in a database system
Stratified sampling of data in a database system
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机译:数据库系统中的数据分层抽样
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摘要
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.
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