How can i fix 'this function has none of deterministic, no sql, or reads sql data' in sql?

Example:

While defining a stored function:

CREATE FUNCTION exampleFunc(x INT) RETURNS INT
BEGIN
    RETURN x + 1;
END;

SQL requires you to specify whether the function is deterministic or not, and how it interacts with data.

Solution:

Add the required characteristics to the function definition.

CREATE FUNCTION exampleFunc(x INT) RETURNS INT
DETERMINISTIC READS SQL DATA
BEGIN
    RETURN x + 1;
END;