Null (SQL) — Null (nulo) es un marcador especial usado en el lenguaje de consulta estructurado (SQL) para indicar que no existe un valor dentro de una base de datos. Introducido por el creador del modelo relacional de bases de datos E. F. Codd, su función es… … Wikipedia Español
Null Device — Genres Electronic Years active 1995–present Website http://www.nulldevice.com Members … Wikipedia
Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… … Wikipedia
Null graph — In the mathematical field of graph theory, the null graph may refer either to the order zero graph, or alternatively, to any edgeless graph (the latter is sometimes called an empty graph). Contents 1 Order zero graph 2 Edgeless graph 3 See also … Wikipedia
Null hypothesis — For the periodical, see Null Hypothesis: The Journal of Unlikely Science. The practice of science involves formulating and testing hypotheses, assertions that are capable of being proven false using a test of observed data. The null hypothesis… … Wikipedia
Order by — An ORDER BY clause in SQL specifies that a SQL SELECT statement returns a result set with the rows being sorted by the values of one or more columns. The sort criteria do not have to be included in the result set. The sort criteria can be… … Wikipedia
Order by (SQL) — An ORDER BY clause in SQL specifies that a SQL SELECT statement returns a result set with the rows being sorted by the values of one or more columns. The sort criteria do not have to be included in the result set. The sort criteria can be… … Wikipedia
Null modem — A null modem adapter Null modem is a communication method to connect two DTEs (computer, terminal, printer etc.) directly using an RS 232 serial cable. The name stems from the historical use of the RS 232 cable to connect two teleprinter devices… … Wikipedia
Null-subject language — In linguistic typology, a null subject language is a language whose grammar permits an independent clause to lack an explicit subject. Such a clause is then said to have a null subject. Typically, null subject languages express person, number,… … Wikipedia
Null subject language — In linguistic typology, a null subject language is a language whose grammar permits an independent clause to lack an explicit subject. Such a clause is then said to have a null subject. Typically, null subject languages express person, number,… … Wikipedia