MySQL query with UNION NOT returning expected results when combining different column types
I need help solving I'm stuck on something that should probably be simple... I've searched everywhere and can't find a clear answer. I'm working with an scenario with a MySQL query where I'm trying to use `UNION` to combine results from two queries that should return related data. However, the results are not what I expect, and I'm not sure why this is happening. I've defined two separate queries that pull data from different tables, but they have mismatched column types. For example, the first table has a column defined as `INT`, while the second table has a column defined as `VARCHAR`. Here's a simplified version of my query: ```sql SELECT id, name FROM users WHERE active = 1 UNION SELECT user_id, CAST(note AS UNSIGNED) FROM notes WHERE deleted = 0; ``` I thought that using `CAST` would help align the types, but I'm still getting records that seem to have the wrong data. In particular, I'm getting unexpected `NULL` values in the results. My MySQL version is 8.0.23, and I verified that there are active users and non-deleted notes. When I run each query independently, they return the correct number of rows. I also tried using `UNION ALL`, but that didn't solve the scenario either. Could this be a question with how MySQL handles type conversion in a `UNION`, or am I missing something else entirely? Any insights or best practices on how to approach this would be greatly appreciated. For context: I'm using Sql on macOS. What am I doing wrong? For reference, this is a production REST API. Thanks, I really appreciate it! Hoping someone can shed some light on this.