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Stratified sampling of data in a database system

  • US 7,069,264 B2
  • Filed: 04/01/2002
  • Issued: 06/27/2006
  • Est. Priority Date: 12/08/1999
  • Status: Expired due to Term
First Claim
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1. A method of performing stratified sampling in a database system, comprising:

  • receiving a query containing a clause indicating stratified sampling of a source table is to be preformed, the clause containing plural stratification conditions that specify plural strata in which sampling is to occur, the clause further containing sample sizes associated with respective strata; and

    generating one or more commands to send to a processing module, the one or more commands containing instructions to evaluate the stratification conditions contained in the clause and to perform stratified sampling of data from the source table, the stratified sampling producing samples having respective sizes specified by the sample sizes in the clause for respective strata.

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