原因是因为 sql 文件编码的问题。不累述，见 https://jira.atlassian.com/browse/SRCTREEWIN-5485 里的解释。
解决方式
Found a solution that makes it work for ST
Put this inside your .gitconfig Either globally in $HOME/.gitconfig or in your repository $REPO/.git/config
[diff "sql"]
textconv = "iconv -f utf-16 -t utf-8"
Then just put the following in .gitattributes
*.sql diff=sql
Works with ST and the MINGW64 console.
Note: This will not work from cmd! If needed it might be doable by creating a different difftool I guess. But don't really care for cmd right now.