Collection

Tag: system-r

System R and SQL: How Declarative Queries Became Practical

IBM's System R project transformed Codd's relational theory into a working system and made SQL the interface through which declarative database querying became practical and commercially influential.

↗

Patricia Selinger and Cost-Based Query Optimization

Patricia Selinger's System R work made declarative SQL practical by estimating the cost of alternative access paths and join orders instead of forcing programmers to choose them by hand.

↗