Independant PL/SQL queries

Hello,
Can we run same code for Functions, Procedures and Cursors on MySQL, PostgreSQL, Oracle and MS-SQL?

MySQL, PostGreSQL, Oracle and MS-SQL are all products that are labeled RDBMS. Hence, these tools will all understand and react correctly to ANSI SQL statements.

Functions, Procedures and Cursors are all super sets of ANSI SQL for each of these products and each product will have a specific flavor of the super set. I believe that this is how these products differentiate between themselves in the RDBMS space.

Hence, I believe that you will not be able to simply copy / paste the codespec of a function, procedure or cursor written for lets say MySQL and expect it to run without any issues on the other RDBMS products.

So it means when you learn PL/SQL queries for one RDBMS, still you need to learn other RDBMS?

Let me rephrase my question.
It means that when you lean one RDBMS you will still need to learn other RDBMS for these super sets?

I'm afraid so.

Although the syntax and semantics do not differ hugely.

Hence, if you learn, let's say PL/SQL the super set of ANSI SQL for Oracle and you can craft Functions, Procedures, Triggers, Cursors and so on effectively in PL/SQL, you should be able to pick up related syntax and semantics of parallel products fairly easily.