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Example of QBE query with joins, designed in Borland's Paradox database. Query by Example (QBE) is a database query language for relational databases.It was devised by Moshé M. Zloof at IBM Research during the mid-1970s, in parallel to the development of SQL. [1]
Database administration is the function of managing and maintaining database management systems (DBMS) software. Mainstream DBMS software such as Oracle , IBM Db2 and Microsoft SQL Server need ongoing management.
Model 204 is commonly used in government and military applications. [8] [9] [10]It was used commercially in the UK by Marks & Spencer. [citation needed] It was also used at the Ventura County Property Tax system in California, [11] the Harris County, Texas, Justice Information Management System, [12] and in the New York City Department of Education's Automate The Schools system.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
Informix [4] [5] [6] is a product family within IBM's Information Management division that is centered on several relational database management system (RDBMS) and multi-model database offerings. The Informix products were originally developed by Informix Corporation , whose Informix Software subsidiary was acquired by IBM in 2001.
Job Control Language (JCL) is a scripting language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem. [1] The purpose of JCL is to say which programs to run, using which files or devices [2] for input or output, and at times to also indicate under what conditions to skip a step.
Document Content Architecture, or DCA for short, is a standard developed by IBM for text documents in the early 1980s. DCA was used on mainframe and IBM i systems and formed the basis of DisplayWrite's file format. DCA was later extended as MO:DCA (Mixed Object Document Content Architecture), which added embedded data files.
"Trigger DXL" is defined in a "Trigger" and stored either in a Module, a Project, or in the Database root. There is no native interface for Triggers; a file-based DXL is needed to create or delete the Trigger. When the Trigger's specified Event occurs (such as Opening a Module) any Triggers associated with that event run in order of priority.