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AN OVERVIEW OF SQL
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The real SQL standard, of course, is the SQL implemented in products that are broadly accepted by the marketplace. For the most part, programmers and users tend to stick with those parts of the language that are fairly similar across a broad range of products. The innovation of the database vendors continues to drive the invention of new SQL capabilities; some products remain years later only for backward compatibility, and some find commercial success and move into the mainstream.
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Although it is the most widely recognized, the ANSI/ISO standard is not the only standard for SQL. X/OPEN, a European vendor group, also adopted SQL as part of its suite of standards for a portable application environment based on UNIX. The X/OPEN standards have played a major role in the European computer market, where portability among computer systems from different vendors is a key concern. Unfortunately, the X/OPEN standard differs from the ANSI/ISO standard in several areas. IBM also included SQL in the specification of its bold 1990s Systems Application Architecture (SAA) blueprint, promising that all of its SQL products would eventually move to this SAA SQL dialect. Although SAA failed to achieve its promise of unifying the IBM product line, the momentum toward a unified IBM SQL continued. With its mainframe DB2 database as the flagship, IBM introduced DB2 implementations for OS/2, its personal computer operating system, and for its RS/6000 line of UNIX-based workstations and servers. By 1997, IBM had moved DB2 beyond its own product line and shipped versions of DB2-Universal Database for systems made by rival manufacturers Sun Microsystems, Hewlett-Packard, and Silicon Graphics, and for Windows NT. IBM further shored up its database software position on non-IBM hardware platforms with its 2001 acquisition of the Informix database. With IBM s historical leadership in relational database technology, the SQL dialect supported by DB2 is a very powerful de facto standard.
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An important area of database technology not addressed by official standards is database interoperability the methods by which data can be exchanged among different databases, usually over a network. In 1989, a group of vendors formed the SQL Access Group to address this problem. The resulting SQL Access Group specification for Remote Database Access (RDA) was published in 1991. Unfortunately, the RDA specification was closely tied to the OSI protocols, which were never widely implemented, so it had little impact. Transparent interoperability among different vendors databases remains an elusive goal. A second standard from the SQL Access Group had far more market impact. At Microsoft s urging and insistence, the SQL Access Group expanded its focus to include a call-level interface for SQL. Based on a draft from Microsoft, the resulting Call-Level Interface (CLI) specification was published in 1992. Microsoft s own Open Database Connectivity (ODBC) specification, based on the CLI standard, was published the same
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year. With the market power of Microsoft behind it, and the open standards blessing of the SQL Access Group, ODBC has emerged as the de facto standard interface for PC access to SQL databases. Apple and Microsoft announced an agreement to support ODBC on Macintosh and Windows in the spring of 1993, giving ODBC industry standard status in both popular graphical user interface environments. ODBC implementations for UNIX-based systems soon followed. In 1995, the ODBC interface effectively became an ANSI/ISO standard, with the publication of the SQL/Call-Level Interface (CLI) standard. Today, ODBC is in its fourth major revision as a cross-platform database access standard. ODBC support is available for all major DBMS brands. Most packaged application programs that have database access as an important part of their capabilities support ODBC, and they range from multimillion-dollar enterprise-class applications like Enterprise Resource Planning (ERP) and Supply Chain Management (SCM) to PC applications such as spreadsheets, query tools, and reporting programs. Microsoft s focus has moved beyond ODBC to higher-level interfaces (such as OLE/DB) and more recently to Active/X Data Objects (ADO), but these new interfaces are layered on top of ODBC for relational database access, and it remains a key cross-platform database access technology.
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