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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… 
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Related topics

Related topics

50 relations
ACM Transactions on Database SystemsAggregate functionB-treeCheck constraint

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
Highly Cited
2011
Highly Cited
2011
Armchair graphene nanoribbons: PT-symmetry breaking and exceptional points without dissipation
We consider a single-layer graphene nanoribbon with armchair edges and with a longitudinally constant external potential… 
Highly Cited
2007
Highly Cited
2007
API Quality by Design Example from the Torcetrapib Manufacturing Process
The concept and application of quality by design (QbD) principles has been and will undoubtedly continue to be an evolving topic… 
Highly Cited
2006
Highly Cited
2006
Population and Diversity: Policy Implications of Emerging Indigenous Demographic Trends
There is a compelling need for fresh perspective on the policy implications of Indigenous demographic trends. Current frameworks… 
2004
2004
DNA-Binding Protein Nanotubes: Learning from Nature's Nanotech Examples
Bacterial pili are nanofibers made of protein subunits. Here we report the controlled assembly of protein nanotubes from an… 
Highly Cited
2001
Highly Cited
2001
To appear in ApJ Letters Preprint typeset using L ATEX style emulateapj v. 14/09/00 THE OPTICALLY-POWERFUL QUASAR E1821+643 IS ASSOCIATED WITH A 300-KPC SCALE FR I RADIO STRUCTURE
  • 2001
  • Corpus ID: 16190255
2001
2001
Movement patterns of female feral camels in central and northern Australia
Movement patterns of female feral camels were studied over four years (February 1993 to December 1996) in central and northern… 
Highly Cited
1992
Highly Cited
1992
The extraction by soil and absorption by plants of applied zinc and cadmium
In five consecutive years lettuce, spinach, spring wheat, endive and maize were grown in pots and the effects of ‘native’ and… 
Highly Cited
1992
Highly Cited
1992
Exaggerated Texture and Grain Growth in a Supperplastic SiAlON
This paper reports on a fine-grained superplastic [beta]-silicon nitride solid solution (SiAlON) which was found to develop… 
Highly Cited
1979
Highly Cited
1979
Hydrolysis of protein in vacuoles isolated from higher plant tissue
THE vacuoles of higher plant cells are known to be sites of deposition of salts and metabolites. A role as the lytic compartment… 
Highly Cited
1970
Highly Cited
1970
Electrostatic Plasma Instabilities Excited by a High‐Frequency Electric Field
The electrostatic plasma waves excited by a uniform, alternating electric field of arbitrary intensity are studied on the basis… 
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