IBM started working on a prototype system loosely based on Codd's concepts as System R in the early 1970s. The first version was ready in 1974/5, and work then started on multi-table systems in which the data could be split so that all of the data for a record (some of which is optional) did not have to be stored in a single large "chunk". Subsequent multi-user versions were tested by customers in 1978 and 1979, by which time a standardized query language – SQL[citation needed] – had been added. Codd's ideas were establishing themselves as both workable and superior to CODASYL, pushing IBM to develop a true production version of System R, known as SQL/DS, and, later, Database 2 (DB2). COUNT 5
QSN1 What is the system IBM created using Codd's research? ANS1 System R QSN2 When was IBM's system released? ANS2 1974/5 QSN3 What did System R work on to change the way data was stored? ANS3 multi-table systems QSN4 When customers first tested IBM's system, what computer language had been added?  ANS4 SQL QSN5 What was the name of the database product created by IBM? ANS5 SQL/DS, and, later, Database 2 (DB2)