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  2. Empty category - Wikipedia

    en.wikipedia.org/wiki/Empty_category

    A null tense marker is when this indication of time undergoes a movement operation in the underlying structure and leaves an empty category behind. In rare cases, a null tense marker can also be the byproduct of a coordination operation, such as in Korean.

  3. Null object pattern - Wikipedia

    en.wikipedia.org/wiki/Null_object_pattern

    In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior.The null object design pattern, which describes the uses of such objects and their behavior (or lack thereof), was first published as "Void Value" [1] and later in the Pattern Languages of Program Design book series as "Null Object".

  4. Data structure diagram - Wikipedia

    en.wikipedia.org/wiki/Data_structure_diagram

    A data structure diagram is a diagram type that is used to depict the structure of data elements in the data dictionary. The data structure diagram is a graphical alternative to the composition specifications within such data dictionary entries. [1] The data structure diagrams is a predecessor of the entity–relationship model (E–R model

  5. B-tree - Wikipedia

    en.wikipedia.org/wiki/B-tree

    If the file fit in a 512 (2 9) word block, then the file directory would point to that physical disk block. If the file fit in 2 18 words, then the directory would point to an aux index; the 512 words of that index would either be NULL (the block isn't allocated) or point to the physical address of the block.

  6. JSON - Wikipedia

    en.wikipedia.org/wiki/JSON

    JSON (JavaScript Object Notation, pronounced / ˈ dʒ eɪ s ən / or / ˈ dʒ eɪ ˌ s ɒ n /) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of name–value pairs and arrays (or other serializable values).

  7. Control character - Wikipedia

    en.wikipedia.org/wiki/Control_character

    The NULL character (code 0) is represented by Ctrl-@, "@" being the code immediately before "A" in the ASCII character set. For convenience, some terminals accept Ctrl-Space as an alias for Ctrl-@. In either case, this produces one of the 32 ASCII control codes between 0 and 31.

  8. First normal form - Wikipedia

    en.wikipedia.org/wiki/First_normal_form

    In the modified structure, the primary key is {Customer ID} in the first relation, and {Customer ID, Transaction ID} in the second relation. Now each row represents an individual credit card transaction, and the DBMS can obtain the answer of interest, simply by finding all rows with a Date falling in October, and summing their Amounts.

  9. Null (SQL) - Wikipedia

    en.wikipedia.org/wiki/Null_(SQL)

    In SQL, NULL is a reserved word used to identify this marker. A null should not be confused with a value of 0. A null indicates a lack of a value, which is not the same as a zero value. For example, consider the question "How many books does Adam own?" The answer may be "zero" (we know that he owns none) or "null" (we do not know how many he owns).