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Was (wer) ist null - definition
Null (SQL)
![omega (ω)]] character is used to represent Null in [[database theory]].](https://commons.wikimedia.org/wiki/Special:FilePath/Db null.png?width=200 "omega (ω)]] character is used to represent Null in [[database theory]].")
![outer join]] query with Null placeholders in the result set. The Null markers are represented by the word <code>NULL</code> in place of data in the results. Results are from [[Microsoft SQL Server]], as shown in SQL Server Management Studio.](https://commons.wikimedia.org/wiki/Special:FilePath/Sql query1.png?width=200 "outer join]] query with Null placeholders in the result set. The Null markers are represented by the word <code>NULL</code> in place of data in the results. Results are from [[Microsoft SQL Server]], as shown in SQL Server Management Studio.")
SPECIAL MARKER AND KEYWORD IN SQL INDICATING THAT SOMETHING HAS NO VALUE
Sql null; NULL (SQL); NVL; NULLIF; SQL CASE; Sql case; Codd tables; Codd table; COALESCE; C-table; Uncertain database; NULL marks; Null (database)
In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E.
null
WIKIMEDIA DISAMBIGUATION PAGE
NULL; Null (computer programming); Null value; Null (computing); Null (Computing); Null (computer); Null (disambiguation); User:SideTime; (null); Nil (programming languages); Null (EP); Null values
adj. (misc.) null and void
null
WIKIMEDIA DISAMBIGUATION PAGE
NULL; Null (computer programming); Null value; Null (computing); Null (Computing); Null (computer); Null (disambiguation); User:SideTime; (null); Nil (programming languages); Null (EP); Null values
¦ adjective
1. (usu. in phr. null and void) having no legal force; invalid.
2. having or associated with the value zero.
Mathematics (of a set or matrix) having no elements, or only zeros as elements.
3. having no positive substance.
¦ noun
1. a dummy letter in a cipher.
2. Electronics a condition in which no signal is generated; something generating no signal.
¦ verb Electronics cancel out, creating a null.
Origin
ME: from Fr. nul, nulle, from L. nullus 'none', from ne 'not' + ullus 'any'.
Beispiele aus Textkorpus für null
1. "This order appears to apply to a null, or virtually null set of government actions," he said.
2. "Mubarak is null and void," the protesters chanted, "Freedom.
3. This ruling is null and void," Zakaria al–Muayad said.
4. Any agreement to the contrary will be null and void.
5. "Serbia declares null and void any decision by the EU on sending a mission to Kosovo.