The correct answer is No each engine implements a distinct SQL dialect and proprietary extensions.

Relational database systems implement the ANSI SQL core but each vendor adds its own dialect and proprietary extensions. These differences show up in data types, built in functions, procedural languages, system catalogs, index and storage options, and administrative commands so SQL written for one engine often needs changes to run on another.

Most core query statements are portable but stored procedures and administrative commands differ is not the best choice because it understates the scope of differences. The distinction is broader than stored procedures and administration and includes types, functions, query planner hints, and other vendor specific features.

Cloud SQL is incorrect because it names a managed database service rather than answering whether MySQL PostgreSQL and Contoso SQL share identical syntax. It does not address SQL dialect compatibility.

All systems strictly follow the ANSI SQL standard with no deviations is incorrect because in practice vendors implement extensions and do not adhere to the standard in every detail. The ANSI standard defines a core but most engines extend or diverge from that core to add features and optimizations.

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