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Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records. An index is a copy of selected columns of data, from a table, that is designed to enable very efficient search.
A bitmap index is a special kind of database index that uses bitmaps.. Bitmap indexes have traditionally been considered to work well for low-cardinality columns, which have a modest number of distinct values, either absolutely, or relative to the number of records that contain the data.
This eliminates the need to reindex free variables, for example when weakening the context, whereas de Bruijn indices eliminate the need to reindex bound variables, for example when substituting a closed expression in another context. [3] De Bruijn indices are not the only representation of λ-terms that obviates the problem of α-conversion.
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Nicole Kidman might still be blushing over some of the scenes she filmed in her new erotic thriller Babygirl, but the film's director said the actress never wavered about the sexual material ...
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Miller columns have several issues from a usability standpoint: Deeper and deeper navigation into directory structures is represented by fitting more and more columns into the display, eventually making each column too narrow to read without scrolling horizontally; the need for scrolling can be reduced or eliminated by using the keyboard to navigate through directories instead of the pointer
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