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Your search keyword '"P Porkaew"' showing total 2 results
Start Over Author "P Porkaew" Topic database management
2 results on '"P Porkaew"'

1. Semantics of Null Values in Subqueries.

Author

Narongrit Waraporn and Kriengkrai Porkaew

Subjects
SEMANTICS, QUERY languages (Computer science), DATABASE management, SQL, DATABASES
Abstract

One of the major language to manipulate databases is SQL which is standardized by the corporation among researchers and commercial database industries. SQL provides NULL values for attributes which are unknown to the user. There are three meanings of NULL but they are not classified by database engines. Results of SQL queries show different meaning when they are produced by subqueries. This paper explains the meaning of them with suggestions proposing to database community. [ABSTRACT FROM AUTHOR]

Published
2008

2. Null Semantics for Subqueries and Atomic Predicates.

Author

Waraporn, Narongrit and Porkaew, Kriengkrai

Subjects
SQL, PROGRAMMING languages, DATABASES, DATABASE searching, INFORMATION retrieval, DATABASE management, QUERY (Information retrieval system), INFORMATION storage & retrieval systems, ELECTRONIC data processing
Abstract

SQL is one of the major languages to manipulate and retrieve data in the databases. It was standardized by the corporation among researchers and commercial database industries into many versions. SQL provides NULL values for attributes which are unknown to the user. There are three meanings of NULL but they are not classified by database engines. Results of SQL queries show different meaning when they are produced by subqueries or atomic predicates. This paper explains the meaning of them with suggestions proposing to database community. [ABSTRACT FROM AUTHOR]

Published
2008

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