Sorry, I forgot about that, because in my today's practical experience only relational databases still matter, so I simply left the other DB models out. My mistake ...
System R was implemented in PL/1, at least most parts of it (or at least the early variants which were used to test the concept). This should have been in the 1975 era. Later versions and esspecially DB2 for MVS may have been rewritten in PL/S or PL/X or how it's called ... http://db.cs.berkeley.edu/cs262/SystemR-annotated.pdf Kind regards Bernd Am 29.01.2018 um 07:17 schrieb Pieter Wiid:
Hierarchical databases (IMS) was released in 1968. I suspect IDMS (network DB) was not far behind. Pieter -----Original Message----- From: IBM Mainframe Assembler List [mailto:ASSEMBLER-LIST@LISTSERV.UGA.EDU] On Behalf Of Bernd Oppolzer Sent: 28 January 2018 23:47 To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Fair comparison C vs HLASM Sorry, but you are mixing up things in a somehow a-historic manner, which needs some corrections: Databases were invented in the mid to late 1970s at IBM (System R, later SQL/DS, later DB2), and the first database systems were implemented in PL/1 on the mainframe ...
