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De - Pt| English Dictionary: SQL | by the DICT Development Group |
| 1 result for SQL | |
| From The Free On-line Dictionary of Computing (15Feb98) [foldoc]: | |
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SQL language for creating, updating and, querying {relational database management systems}. SQL was developed by {IBM} in the 1970s for use in {System R}. It is the {de facto standard} as well as being an {ISO} and {ANSI} {standard}. It is often embedded in general purpose programming languages. The first SQL standard, in 1986, provided basic language constructs for defining and manipulating {tables} of data; a revision in 1989 added language extensions for {referential integrity} and generalised {integrity} {constraints}. Another revision in 1992 provided facilities for {schema} manipulation and {data administration}, as well as substantial enhancements for data definition and data manipulation. Development is currently underway to enhance SQL into a computationally complete language for the definition and management of {persistent}, complex objects. This includes: generalisation and specialisation hierarchies, {multiple inheritance}, user defined {data types}, {triggers} and {assertions}, support for {knowledge based systems}, {recursive query expressions}, and additional data administration tools. It also includes the specification of {abstract data types} (ADTs), object identifiers, {methods}, {inheritance}, {polymorphism}, {encapsulation}, and all of the other facilities normally associated with object data management. The emerging {SQL3} standard is expected to be complete in 1998. According to Allen G. Taylor, SQL does _not_ stand for "Structured Query Language". That, like "SEQUEL" (and its pronunciation /see'kw*l/), was just another unofficial name for a precursor of SQL. However, the IBM SQL Reference manual for DB2 and Craig Mullins's "DB2 Developer's Guide" say SQL _does_ stand for "Structured Query Language". {SQL Standards (http://www.jcc.com/sql_stnd.html)}. {An SQL parser (ftp://ftp.uu.net/published/oreilly/nutshell/lexyacc/)} is described in "Lex & Yacc", by Levine, Mason & Brown published by O'Reilly. {The 1995 SQL Reunion: People, Projects, and Politics (http://www.mcjones.org/System_R/SQL_Reunion_95/)}. ["A Guide to the SQL Standard", C.J. Date, A-W 1987]. ["SQL for Dummies", Allen G. Taylor, IDG Books Worldwide]. (2000-07-07) | |
