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Example of a flat file model [1] A flat-file database is a database stored in a file called a flat file. Records follow a uniform format, and there are no structures for indexing or recognizing relationships between records. The file is simple. A flat file can be a plain text file (e.g. csv, txt or tsv), or a binary file. Relationships can be ...
In computing, dir (directory) is a command in various computer operating systems used for computer file and directory listing. [1] It is one of the basic commands to help navigate the file system . The command is usually implemented as an internal command in the command-line interpreter ( shell ).
In computer software, specifically the DCL command-line interface of the OpenVMS operating system, the DIRECTORY command (often abbreviated as DIR) is used to list the files inside a directory. [1] It is analogous to the DOS dir and Unix ls commands.
PowerShell 7 is the replacement for PowerShell Core 6.x products as well as Windows PowerShell 5.1, which is the last supported Windows PowerShell version. [ 110 ] [ 108 ] The focus in development was to make PowerShell 7 a viable replacement for Windows PowerShell 5.1, i.e. to have near parity with Windows PowerShell in terms of compatibility ...
PowerShell: The New-Item cmdlet of Windows PowerShell that can create empty files, folders, junctions, and hard links. [3] In PowerShell 5.0 and later, it can create symbolic links as well. [4] The Get-Item and Get-ChildItem cmdlets can be used to interrogate file system objects, and if they are NTFS links, find information about them.
PHP? – PHP (? = version number) PL – Perl; PM – Perl module; PS1 – Windows PowerShell shell script; PS1XML – Windows PowerShell format and type definitions; PSC1 – Windows PowerShell console file; PSD1 – Windows PowerShell data file; PSM1 – Windows PowerShell module file; PY – Python; PYC – Python byte code files; PYO ...
A surrogate key (or synthetic key, pseudokey, entity identifier, factless key, or technical key [citation needed]) in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data, unlike a natural (or business) key. [1]
Therefore, a relation can have multiple candidate keys, each with a different number of attributes. [2] Specific candidate keys are sometimes called primary keys, secondary keys or alternate keys. The columns in a candidate key are called prime attributes, [3] and a column that does not occur in any candidate key is called a non-prime attribute.