CREATE FUNCTION error “This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA”

Question

Our database has a function to generate an order number. It reads a value from a Settings table, increments it, then returns the new value. For example:

CREA         


        

Answer 1

Could I instead just flag the function as NO SQL to suppress the warning? I tried it and it worked. Will this cause any problem?

According to this Mysql doc:

Assessment of the nature of a function is based on the “honesty” of the creator: MySQL does not check that a function declared DETERMINISTIC is free of statements that produce nondeterministic results.

So it's up to you. If you are sure the method won't cause any problem...