ISBL

ISBL (Information Systems Base Language) is the relational algebra notation that was invented for PRTV, one of the earliest database management systems to implement E.F. Codd's relational model of data.

Example

 
OS = ORDERS * SUPPLIERS
LIST OS: NAME="Brooks" % SNAME, ITEM, PRICE
gollark: And you don't need a cheap monitor, you could plausibly use an expensive one.
gollark: Well, you can technically operate your computer over a serial port or LAN.
gollark: What? That's a basic feature. osmarkscalculator™ can do that.
gollark: Do you have a case, PSU. etc?
gollark: No you don't.

See also
  • IBM Business System 12 - An IBM industrial strength relational DBMS influenced by ISBL. It was developed for use by customers of IBM's time-sharing service bureaux in various countries the early 1980s.


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