This article does not cite any sources. (September 2016) (Learn how and when to remove this template message)
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.
OS = ORDERS * SUPPLIERS LIST OS: NAME="Brooks" % SNAME, ITEM, PRICE
Manage research, learning and skills at NCR Works. Create an account using LinkedIn to manage and organize your omni-channel knowledge. NCR Works is like a shopping cart for information -- helping you to save, discuss and share.