This is an old revision of this page, as edited by Decibel(talk | contribs) at 16:18, 20 January 2007(←Created page with 'An '''expression index''' is a databaseindex that is built on a generic expression, rather than on a...'). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.Revision as of 16:18, 20 January 2007 by Decibel(talk | contribs)(←Created page with 'An '''expression index''' is a databaseindex that is built on a generic expression, rather than on a...')
An expression index is a databaseindex that is built on a generic expression, rather than on a list of columns. This allows indexes to be defined for common
which has some condition applied to it such that it only includes a portion of the rows in the table.
