I exported a live MySQL database (running mysql 5.0.45) to a local copy (running mysql 5.1.33) with no errors upon import. There is a view in the database, that when executed locally, returns a different set of data than when executed remotely. It’s returning 32 results instead of 63. When I execute the raw sql, the same problem occurs. I’ve inspected the data in all tables being joined, and the counts are the same.
The query is simple and has no where conditions – but about 10 joins. Aside from the differences in mysql versions… I can’t find any reason that this query would return different results between databases… since they are effectively exact copies.
Has anyone experienced a problem like this before?
The problem was that certain rows in the exported DB had IDs of 0, but when imported were given a positive integer ID. As a result, the broken FK references caused the different resulting queries.