History of SQL

• pre-70’s—hierarchical and network databases

• 1970—E.F. Codd defines relational model

• 1974—IBM System/R project, inc. SEQUEL lang.

• 1978—System/R customer tests

• 1979—Oracle introduces commercial RDBMS

• 1981—IBM introduces SQL/DS

• 1983—IBM introduces DB2

• 1986—ANSI SQL1 standard ratified

• 1992—ANSI SQL2 standard ratified

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