Now-a-days, incompleteness of dimension information is a common problem in many databases including web heterogonous databases, multi-relational databases, spatial and temporal databases and data integration. As providing accurate results that best meet the query conditions over incomplete database. To retrieve data from incomplete database is not a trivial task. This problem introduces challenges in processing query. Dimension incomplete problem causes due to collection of data from noisy network environment. Some of these techniques retrieve the query results based on the existing values rather than estimating the missing values.