Skip to search formSkip to main content
You are currently offline. Some features of the site may not work correctly.

Null (SQL)

Known as: Sql case, NULLIF, C-table 
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… Expand
Wikipedia

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
Highly Cited
2008
Highly Cited
2008
This paper explores the potential for wiki-type open architecture software to promote and support collaborative learning through… Expand
Highly Cited
2008
Highly Cited
2008
Abstract There are two logics or mindsets from which to consider and motivate a transition from goods to service(s). The first… Expand
  • figure 1
  • table 1
Highly Cited
2003
Highly Cited
2003
Current scientific techniques in genomics and image processing routinely produce hypothesis testing problems with hundreds or… Expand
Highly Cited
2000
Highly Cited
2000
We incorporate a simple scheme for the growth of supermassive black holes into semi-analytic models that follow the formation and… Expand
  • figure 1
  • figure 2
  • figure 3
  • figure 4
  • figure 5
Highly Cited
1999
Highly Cited
1999
In the rapidly growing literatures on globalisation, many authors have emphasised the apparent disembedding of social relations… Expand
  • table 1
Highly Cited
1998
Highly Cited
1998
Abstract Metal nanoshells, consisting of a dielectric core with a metallic shell of nanometer thickness, are a new, composite… Expand
Highly Cited
1997
Highly Cited
1997
This paper develops a theory of strategic group identity that explains how strategic groups emerge in an industry and how they… Expand
Highly Cited
1990
Highly Cited
1990
New acoustic waves originating from a balance of dust particle inertia and plasma pressure are investigated. It is shown that… Expand
Highly Cited
1990
Highly Cited
1990
The PVM system is a programming environment for the development and execution of large concurrent or parallel applications that… Expand
  • figure 1
  • table 1
  • table 2
  • table 3
  • table 4
Highly Cited
1990
Highly Cited
1990
Part 1 Basics: criticism and knowledge empirical study critical and conventional ethnography the critical tradition elements of… Expand