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» Auditing SQL Queries
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IIE
2007
94views more  IIE 2007»
14 years 9 months ago
A System Employing Peer Review and Enhanced Computer Assisted Assessment of Querying Skills
In recent years a small number of web-based tools have been proposed to help students learn to write SQL query statements and also to assess students’ SQL writing skills. SQLify ...
Michael de Raadt, Stijn Dekeyser, Tien Yu Lee
INFSOF
2007
148views more  INFSOF 2007»
14 years 9 months ago
Mutating database queries
A set of mutation operators for SQL queries that retrieve information from a database is developed and tested against a set of queries drawn from the NIST SQL Conformance Test Sui...
Javier Tuya, María José Suáre...
AMW
2010
14 years 8 months ago
SQL Nested Queries in SPARQL
SPARQL currently does not include any form of nested queries. In this paper we present a proposal to incorporate nested queries into SPARQL along the design philosophy of SQL neste...
Renzo Angles, Claudio Gutierrez
SIGMOD
2007
ACM
105views Database» more  SIGMOD 2007»
15 years 10 months ago
Nulls, three-valued logic, and ambiguity in SQL: critiquing date's critique
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....
Claude Rubinson
SIGMOD
1997
ACM
91views Database» more  SIGMOD 1997»
15 years 1 months ago
On Saying "Enough Already!" in SQL
In this paper, we study a simple SQL extension that enables query writers to explicitly limit the cardinality of a query result. We examine its impact on the query optimization an...
Michael J. Carey, Donald Kossmann