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This specific example uses only one table. The columns include: name (a person's name, second column); team (the name of an athletic team supported by the person, third column); and a numeric unique ID, (used to uniquely identify records, first column). Here is an example textual representation of the described data:
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 ).
PowerShell is a task automation and configuration management program from Microsoft, consisting of a command-line shell and the associated scripting language.Initially a Windows component only, known as Windows PowerShell, it was made open-source and cross-platform on August 18, 2016, with the introduction of PowerShell Core. [9]
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.
ADP – Microsoft Access project (used for accessing databases on a server) MDE – Compiled Microsoft Database (Access) MDF – Microsoft SQL Server Database; MYD – MySQL MyISAM table data; MYI – MySQL MyISAM table index; NCF – Lotus Notes configuration file; NSF – Lotus Notes database; NTF – Lotus Notes database design template
instruct the directory command to also display the ownership of the files. Note the Directory command name is not case sensitive, and can be abbreviated to as few letters as required to remain unique. Windows: DIR/Q/O:S d* dir /q d* /o:s: display ownership of files whose names begin with d (or D), sorted by size, smallest first.
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.
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]