When working with conditional logic in native SQL queries, it can be difficult to avoid running into the "could not determine data type of parameter" problem in JPA with PostgreSQL. Nullable fields, like UUID parameters, frequently cause this problem since PostgreSQL necessitates a more specific type description. Using COALESCE to manage null values or moving to JdbcTemplate for more precise control over SQL types are two solutions. These techniques guarantee seamless query execution, particularly when dealing with intricate, real-world data situations.

Many developers get into the "relation does not exist" error after switching from MariaDB to PostgreSQL, particularly when working with Keycloak tables like user_entity. The way that PostgreSQL handles concurrent connections and table access causes problems even when the schema seems to be correct.