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The first released RDBMS that was a relatively faithful implementation of the relational model was the [[Multics Relational Data Store]], first sold in [[1978]]. Others have been [[Berkeley Ingres QUEL]] and [[IBM BS12]].
Today, popular commercial RDBMS's for large databases include [[Oracle]], [[Microsoft SQL Server]], [[Sybase SQL Server]], and IBM's [[DB2]]. The most commonly used free RDBMS's are [[MySQL]], [[PostgreSQL]] and [[
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