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: I generally only interact with modern hardware, and over SSH.
gollark: Well, I'm not, see.
gollark: If I'm on a connection that high latency I can just use mosh, which does some magic to compensate for it on the client, and continue using nano.
gollark: I heard about a project using a USB/VGA adapter as a bad transmit-only SDR.
gollark: Hello, would you like to hear a TCP joke?Yes, I'd like to hear a TCP joke.OK, I'll tell you a TCP joke.OK, I'll hear a TCP joke.Are you ready to hear a TCP joke?Yes, I am ready to hear a TCP joke.OK, I'm about to send the TCP joke. It will last 10 seconds, it has two characters, it does not have a setting, it ends with a punchline.OK, I'm ready to hear the TCP joke that will last 10 seconds, has two characters, does not have a setting and will end with a punchline.I'm sorry, your connection has timed out... ...Hello, would you like to hear a TCP joke?

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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