Results 91 to 100 of about 39,785 (127)

Determining households from patient addresses and unique property reference numbers in general practitioner electronic health records. [PDF]

Int J Popul Data Sci
Harper G, Firman N, Wilk M, Marszalek M, Simon P, Stables D, Fry R, Smith K, Dezateux C.   +8 more
europepmc   +1 more source

Publication, funding, and experimental data in support of Human Reference Atlas construction and usage. [PDF]

Sci Data
Kong Y, Börner K.
europepmc   +1 more source

Using Social Vulnerability Indices to Predict Priority Areas for Prevention of Sudden Unexpected Infant Death in Cook County, IL: Cross-Sectional Study.

JMIR Public Health Surveill
Riggins DP, Zhang H, Trick WE.
europepmc   +1 more source

CohortSymmetry: An R package to perform sequence symmetry analysis using the OMOP common data model

Chen X, Stanford T, Guo Y, Raventós B, Du M, Li X, Lam A, Corby G, Mercadé-Besora N, Alcalde-Herraiz M, López-Güell K, Delmestri A, Man WY, Prieto-Alhambra D, Burn E, Català M, Pratt N, Jödicke A, Newby D.   +18 more
europepmc   +1 more source

Null values in SQL

ACM SIGMOD Record, 2008
In various writings over the past 20 years, such as [3], Date has pointed out that SQL produces incorrect answers to some queries where a null value is included in a table. In a recent article in the ACM SIGMOD Record, [8], Rubinson states that "Date misinterprets the meaning of his example query" and "SQL returns the correct answer to the query posed".
John Grant
openaire   +2 more sources

Nulls, three-valued logic, and ambiguity in SQL

ACM SIGMOD Record, 2007
Date's popular critique of SQL's three-valued logic [4, 3] purports to demonstrate that SQL queries can produce erroneous results when nulls are present in the database. I argue that this critique is flawed in that Date misinterprets the meaning of his example query.
Claude Rubinson
openaire   +2 more sources

NULL-Werte und dreiwertige Logik in SQL

, 1992
In relationalen Datenbanken ist es ublich, das gewisse Felder „NULL“ sein konnen (vgl. [Date86]). Wir sagen hier bewust nicht „den Wert NULL haben“. NULL kann u.a. bedeuten, das der aktuelle Wert eines Attributs unbekannt ist. Andere Arten von Nullen, wie z.B. „nicht anwendbar“ oder „gibt es nicht“ werden hier nicht behandelt, (vgl.
Günter Matthiessen
openaire   +2 more sources

A critique of Claude Rubinson's paper nulls, three - valued logic, and ambiguity in SQL

ACM SIGMOD Record, 2008
I’d like to thank Claude Rubinson for his thoughtful critique [3] of my remarks in reference [1] on nulls and three-valued logic (3VL). Clearly we’re in agreement on the major issues; as Rubinson says, “I agree with Date that three-valued logic is incompatible with database management systems.” We also agree that null isn’t a value; as Rubinson says ...
C. J. Date
openaire   +2 more sources