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PURPOSE To examine the association between household use of biomass fuels for cooking and birth weight. METHODS Analysis is based on 3559 childbirths in the 5 years preceding the 1999 Zimbabwe Demographic and Health Survey. Birth weights, recorded by trained professionals at local health clinics, were derived from health cards at home or from mother's(More)
Column stores have been widely applied in mass data processing for its great superiority compared to row stores, especially in the field of Online Analytical Processing(OLAP) which requires a significant response speed of query and meanwhile less storage space. Materialization strategies is a very practical query optimization technology used in column(More)
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