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  2. Pivot table - Wikipedia

    en.wikipedia.org/wiki/Pivot_table

    Pivot table. A pivot table is a table of values which are aggregations of groups of individual values from a more extensive table (such as from a database, spreadsheet, or business intelligence program) within one or more discrete categories. The aggregations or summaries of the groups of the individual terms might include sums, averages ...

  3. Virtual column - Wikipedia

    en.wikipedia.org/wiki/Virtual_column

    In relational databases a virtual column is a table column whose value(s) is automatically computed using other columns values, or another deterministic expression. Virtual columns are defined of SQL:2003 as Generated Column, and are only implemented by some DBMSs, like MariaDB, SQL Server, Oracle, PostgreSQL, SQLite and Firebird (database server) (COMPUTED BY syntax).

  4. Microsoft Access - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Access

    Microsoft Access. Microsoft Access is a database management system (DBMS) from Microsoft that combines the relational Access Database Engine (ACE) with a graphical user interface and software-development tools. It is a member of the Microsoft 365 suite of applications, included in the Professional and higher editions or sold separately.

  5. Digest access authentication - Wikipedia

    en.wikipedia.org/wiki/Digest_access_authentication

    The "response" value is calculated in three steps, as follows. Where values are combined, they are delimited by colons. The MD5 hash of the combined username, authentication realm and password is calculated. The result is referred to as HA1. The MD5 hash of the combined method and digest URI is calculated, e.g. of "GET" and "/dir/index.html ...

  6. Open-fields doctrine - Wikipedia

    en.wikipedia.org/wiki/Open-fields_doctrine

    The open-fields doctrine (also open-field doctrine or open-fields rule ), in the U.S. law of criminal procedure, is the legal doctrine that a " warrantless search of the area outside a property owner's curtilage " does not violate the Fourth Amendment to the United States Constitution. However, "unless there is some other legal basis for the ...

  7. Ethernet frame - Wikipedia

    en.wikipedia.org/wiki/Ethernet_frame

    A data packet on the wire and the frame as its payload consist of binary data. Ethernet transmits data with the most-significant octet (byte) first; within each octet, however, the least-significant bit is transmitted first. [a] The internal structure of an Ethernet frame is specified in IEEE 802.3. [2]

  8. Row- and column-major order - Wikipedia

    en.wikipedia.org/wiki/Row-_and_column-major_order

    In computing, row-major order and column-major order are methods for storing multidimensional arrays in linear storage such as random access memory . The difference between the orders lies in which elements of an array are contiguous in memory. In row-major order, the consecutive elements of a row reside next to each other, whereas the same ...

  9. Carrier-sense multiple access with collision detection

    en.wikipedia.org/wiki/Carrier-sense_multiple...

    Carrier-sense multiple access with collision detection. Carrier-sense multiple access with collision detection ( CSMA/CD) is a medium access control (MAC) method used most notably in early Ethernet technology for local area networking. It uses carrier -sensing to defer transmissions until no other stations are transmitting.