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Just as the 3GL offered greater power to the programmer, so too did the 4GL open up the development environment to a wider population. The early input scheme for the 4GL supported entry of data within the 72-character limit of the punched card (8 bytes used for sequencing) where a card's tag would identify the type or function.
The LIST command is somewhat analogous to the SQL SELECT statement, but incorporates formatting, totaling, and other elements helpful for tailoring output to a business requirement. The SELECT statement, in contrast, is essentially a data query tool: its results would be processed or formatted as required using other mechanisms.
With features like Record Structure and subroutines it allows a user to get data from a database and manipulate it by storing it in a temporary structure; execute a particular section of the code, if required using a subroutine. Complete for CCL (Cerner Command Language) is provided by Cerner Corporation.
SheerPower 4GL has several key features: It is free for hobbyists and non-profit organizations. Web scripting features make it fast and easy to develop dynamic web pages using SheerPower's BASIC-like syntax. [3] Version 5.0 was the official release containing the syntax and logic for web scripting in SheerPower.
Informix-4GL is a 4GL programming language developed by Informix during the mid-1980s. [ 1 ] [ 2 ] [ 3 ] At the time of its initial release in 1986, supported platforms included Microsoft Xenix (on IBM PC AT ), DEC Ultrix (running on Microvax II , VAX-11/750 , VAX-11/785 , VAX 8600 ), Altos 2086 , AT&T 3B2 , AT&T 3B5, AT&T 3B20 and AT&T Unix PC .
In the early 1990s, a new PC-based tool for developing LINC specifications was released, the LINC Development Assistant (LDA). LDA was written in a mixture of Smalltalk and C++ rather than the LINC 4GL (the latter of which was not intended to run on a personal computer). From version 17, it was intended that all development be done with LDA.
Also, there were a few things that had to be done to the source code in order to generate compiled code. For example, the GO command to run the source code was equivalent to the BUILD command to generate the compiled code. Commands could be abbreviated to the first three characters when writing source code.
Invented in 1980, Cyberquery is a declarative "4GL" fourth-generation programming language. Its early design was slightly influenced by RAMIS and other data access and analysis languages such as the query language on GE time sharing systems. Cyberquery automates the process of accessing files or tables and reading records or rows.