I need a tool that show me the differences between two .sdf files. Is there something I can download or do I have to write some code?
There are a number of companies which make schema comparison tools for SQL Server (which I presume is what underlies your question). For instance xSQL Software offers xSQL Object, which is free for certain editions of SQL Server. Red-Gate have SQL Compare, which has a 14-day trial.
If you are looking for something FOSS, there is Open DBDiff.
If you are running on linux you can compare any two files, or directories for that matter, using the diff command. The syntax is quite simple: diff item1 item2 . For more info use man diff or check out this link.
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