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SQL in Perspective
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interactions with web sites. Database management thus touches every segment of the computer market. Since the late 1980s a specific type of DBMS, called a relational database management system (RDBMS), has become so popular that it is the standard database form. Relational databases organize data in a simple, tabular form and provide many advantages over earlier types of databases. SQL is specifically a relational database language used to work with relational databases.
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AN OVERVIEW OF SQL
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A Brief History of SQL
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The history of the SQL language is intimately intertwined with the development of relational databases. Table 3-1 shows some of the milestones in its 30-year history. The relational database concept was originally developed by Dr. E.F. Ted Codd, an IBM researcher. In June 1970, Dr. Codd published an article entitled A Relational Model of Data for Large Shared Data Banks that outlined a mathematical theory of how data could be stored and manipulated using a tabular structure. Relational databases and SQL trace their origins to this article, which appeared in the Communications of the Association for Computing Machinery.
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Date
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1970 1974 1974 1978 1979 1981 1981 1982 1983 1986 1986 1987 Table 3-1.
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Codd defines relational database model IBM begins System/R project First article describing the SEQUEL language is published System/R customer tests are conducted Oracle introduces first commercial RDBMS Relational Technology introduces Ingres IBM announces SQL/DS ANSI forms SQL standards committee IBM announces DB2 ANSI SQL1 standard is ratified Sybase introduces RDBMS for transaction processing ISO SQL1 standard is ratified
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Milestones in SQL Development
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SQL: The Complete Reference
Date
1988 1989 1990 1991 1992 1992 1992 1993 1993 1994 1996 1997 1997 1998 1998 1998 1999 2000 2000 2001 2001 2002 Table 3-1.
Event
Ashton-Tate and Microsoft announce SQL Server for OS/2 First TPC benchmark (TPC-A) is published TPC-B benchmark is published SQL Access Group database access specification is published Microsoft publishes ODBC specification ANSI SQL2 standard (SQL-92) is ratified TPC-C (OLTP) benchmark is published Specialized SQL data warehousing systems are shipped for the first time ODBC products are shipped for the first time Parallel database server technology is shipped commercially Standard API for OLAP database access and OLAP benchmark is published IBM DB2 UDB unifies DB2 architecture across IBM and other vendor platforms Major DBMS vendors announce Java integration strategies Microsoft SQL Server 7 provides enterprise-level database support for Windows NT Oracle 8i provides database/Internet integration and moves away from client/server model Commercial in-memory database products are shipped for the first time J2EE standardizes JDBC database access from application servers Oracle introduces application servers with integrated database caching Microsoft introduces SQL Server 2000, aimed at enterprise applications XML integration capabilities appear in mainstream RDBMS products IBM acquires Informix database business Gartner ranks IBM as #1 database vendor, passing Oracle
Milestones in SQL Development (continued)
3:
SQL in Perspective
The Early Years
Codd s article triggered a flurry of relational database research, including a major research project within IBM. The goal of the project, called System/R, was to prove the workability of the relational concept and to provide some experience in actually implementing a relational DBMS. Work on System/R began in the mid-1970s at IBM s Santa Teresa laboratories in San Jose, California. In 1974 and 1975, the first phase of the System/R project produced a minimal prototype of a relational DBMS. In addition to the DBMS itself, the System/R project included work on database query languages. One of these languages was called SEQUEL, an acronym for Structured English Query Language. In 1976 and 1977, the System/R research prototype was rewritten from scratch. The new implementation supported multitable queries and allowed several users to share access to the data. The System/R implementation was distributed to a number of IBM customer sites for evaluation in 1978 and 1979. These early customer sites provided some actual user experience with System/R and its database language, which, for legal reasons, had been renamed SQL, or Structured Query Language. Despite the name change, the SEQUEL pronunciation remained and continues to this day. In 1979 the System/R research project came to an end, with IBM concluding that relational databases were not only feasible, but could be the basis for a useful commercial product.
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