3. External access to the DBMS
Using these different access modes, external actors interact with the DB. They access it either directly in SQL language (data definition, manipulation, interrogation and control), or through a host language (Java, C, C++, C#, Php, etc.). It should be noted that the declarative SQL language (standardized) has been extended by procedural languages, generally imperative and proprietary (PL/SQL for Oracle, Transact-SQL for MS SQL Server...).
3.1 Application architectures
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External access to the DBMS
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