Java and Database Connectivity
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SQL: History and Background
or 'none of this is new' part three
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Theory of Relations from Mathematics
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Ted Codd, 1970 - definition of relational databases
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SEQUEL, IBM, mid-70s - precursor to SQL
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1979, Oracle adopts SQL
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1981, Ingres adopts SQL
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ANSI SQL, 1982 onwards, first standard 1986
Standard used by JDBC is ANSI 92