|
PRTV
PRTV (''Peterlee Relational Test Vehicle'') was the world's first relational database management system that could handle significant data volumes. It was a relational query system with powerful query facilities, but very limited update facility and no simultaneous multiuser facility. PRTV was a successor from the very first relational implementation, IS1. Features PRTV included several firsts in the relational database area: * implemented relational optimizer * implemented cost-based relational optimizer * handle tables of 1,000 rows up to 10,000,000 rows * user-defined functions (UDFs) within an RDB (also a large suite of built-in functions such as trigonometric and statistical) * geographic information system based on an RDB (using UDFs such as point-in-polygon). PRTV was based on a relational algebra, Information Systems Base Language (ISBL) and followed the relational model very strictly. Even features such as user-defined functions were formalized within that model. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Relational Database Management System
A relational database is a (most commonly digital) database based on the relational model of data, as proposed by E. F. Codd in 1970. A system used to maintain relational databases is a relational database management system (RDBMS). Many relational database systems are equipped with the option of using the SQL (Structured Query Language) for querying and maintaining the database. History The term "relational database" was first defined by E. F. Codd at IBM in 1970. Codd introduced the term in his research paper "A Relational Model of Data for Large Shared Data Banks". In this paper and later papers, he defined what he meant by "relational". One well-known definition of what constitutes a relational database system is composed of Codd's 12 rules. However, no commercial implementations of the relational model conform to all of Codd's rules, so the term has gradually come to describe a broader class of database systems, which at a minimum: # Present the data to the user as re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM IS1
IS/1 was the world's first relational database system, implemented at the IBM United Kingdom Scientific Centre in Peterlee in the years 1970–1972.Notley, M, "Peterlee IS/1 System", UKSC Report 18, 1972 It had limited facilities but implemented a true relational model. It was the precursor to PRTV PRTV (''Peterlee Relational Test Vehicle'') was the world's first relational database management system that could handle significant data volumes. It was a relational query system with powerful query facilities, but very limited update facility a .... References IS1 Relational database management systems {{database-software-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
User-defined Function
A user-defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. UDFs are usually written for the requirement of its creator. BASIC language In some old implementations of the BASIC programming language, user-defined functions are defined using the "DEF FN" syntax. More modern dialects of BASIC are influenced by the structured programming paradigm, where most or all of the code is written as user-defined functions or procedures, and the concept becomes practically redundant. COBOL language In the COBOL programming language, a user-defined function is an entity that is defined by the user by specifying a FUNCTION-ID paragraph. A user-defined function must return a value by specifying the RETURNING phrase of the procedure division header and they are invoked using the function-identifier syntax. See the ISO/IEC 1989:2014 Programming Language COBOL s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ML/I
ML/1 (Macro Language/One) is a powerful general-purpose macro processor. Typical uses of ML/1 include: * editing, modifying, correcting, or reformatting text files * translating source code from one programming language to another * acting as a source-code preprocessor to allow the user to add new syntactic forms to an existing programming language *supporting program source-code parameterization (e.g. a parameter might determine whether debugging statements are to be included in the program source code that is passed to the compiler) ML/1 was developed in 1966 by Peter J. Brown as part of PhD research at Cambridge University in England. In 1984, Robert D. Eager, one of Peter Brown's colleagues at the University of Kent, rewrote ML/I, first in BCPL in 1981, and later in C in 1984, which increased its portability. * Note that Peter Brown's original name for the language was ML/I, where (as in IBM's PL/I) the last character is the Roman numeral "I", not the Arabic numeral "1" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TRAC (programming Language)
TRAC (for Text Reckoning And Compiling) Language is a programming language developed between 1959–1964 by Calvin Mooers and first implemented on the PDP-1 in 1964 by L. Peter Deutsch. It was one of three "first languages" recommended by Ted Nelson in ''Computer Lib''. TRAC T64 was used until at least 1984, when Mooers updated it to TRAC T84. Language description TRAC is a purely text-based language — a kind of macro language. Unlike traditional ''ad hoc'' macro languages of the time, such as those found in assemblers, TRAC is well planned, consistent, and in many senses complete. It has explicit input and output operators, unlike the typical implicit I/O at the outermost macro level, which makes it simultaneously simpler and more versatile than older macro languages. It also differs from traditional macro languages in that TRAC numbers are strings of digits, with integer arithmetic (without specific limits on maximum values) being provided through built-in ("primitive") f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
