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Asked: 2026-05-11T09:28:03+00:00

I’ve read that although SQL is meant to be standardised, it is implemented different

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I’ve read that although SQL is meant to be standardised, it is implemented different etc with different databases. I have only ever used MySQL for databases.

What I would like to know is what other databases share the same syntax? I am using PDO now, and I would like to set a flag to allow the user to specify which database they would like to use.

I would be interested in knowing which are the ‘safe’ databases that will handle most (if not all) my general MySQL queries. Mainly SELECT, INSERT, UPDATE, DROP, DELETE.

Thanks

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  1. There are several revisions of a such called ANSI SQL.

    All major database engines (that is Oracle, MS SQL, PostgreSQL and MySQL) should (should) in theory support SQL-92.

    This includes everything you’ve mentioned: SELECT, INSERT, UPDATE, DROP, DELETE, as long as you don’t use complex clauses with them.

    In practice:

    1. Not all databases support the full set of SQL-92.

      Writing cross-platform SQL even in SQL-92 requires lots of testing.

    2. Platform independency in SQL ends when you insert your 1001st row and need to optimize you queries.

      If you browse a little over StackOverflow questions tagged SQL, you will see that most of them say ‘help me to optimize this query‘, and most answers say ‘use this platform dependent hack‘

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