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Am wondering if there are guidelines somewhere to write SQL code which is compatible in SQL Server, mySQL as well as postgreSQL. I am writing a program and the user has a choice of backend database. It will be really difficult for me to create separate queries for each and every db. I do not want to use an ORM or anything like that.
Thank you for your time.
Well, the best path you can choose consist in adopting the SQL ISO Standard.
Postgres and MySQL are heavy supporters, but I don’t know if you could say the same about SQL Server.
Anyway, i think that an ORM solution could be the best for you, because usually they abstract these differences very well.
But if you don’t wanna use it you can always store your queries in different repositories, each one for a specific database and load them at runtime.