InfluxDB has specific requirements and syntax rules when it comes to querying data, particularly when using boolean values in queries versus writing them. When querying data from a retention policy that is not the default, the measurement must be fully qualified with both the database and retention policy names. Additionally, when using boolean values in queries, they must be referenced as `true`, `True`, or `TRUE` to match the expected syntax for writes. Understanding these nuances can help users successfully query their data and avoid empty responses.