Tag: sql

Oracle helped turn relational theory and SQL from research ideas into a commercial software business, shipping Oracle V2 in 1979 and pursuing portability across computing platforms.

IBM DB2 carried the relational model and SQL into the mainframe center of enterprise computing, proving that relational databases could support large, mission-critical transaction workloads.

SQLite reversed the usual database architecture by putting a transactional SQL engine inside the application process, eliminating the separate server and turning a database into a library and file format deployed almost everywhere.

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'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.