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I am writing my queries in ‘standard’ / ‘generic’ SQL so that it runs on any database (MySQL, Postgre etc).
I’d like to use DATE_ADD() of MySQL. In Postgre, it would be done with something like '2001-01-01'::timestamp + '1 year'::interval;.
Is there a more ‘general’ way of writing it so that it runs on both MySQL and Postgre (or others) ?
No, there are not SQL standard functions for date addition.
Depending on how you’re building your app (using a database abstraction layer and/or interface layer), you could probably handle it in a generic way there, and still have the database doing the math, not your code.