SQL Server2014和VS2015应该是没有安装顺序要求的。
如果是SQL Server报错,具体是什么错误信息?个人建议你修复一下SQL Server,或者你确定一下没有安装VS2015之前是不是也有问题,这样就能确定是不是SQL Server本身安装就有问题。
VS2015里面安装的时候有个SSDT选项,应该是和自带的localdb有关,安装的时候记得勾选。
另外VS2015你可以从控制面板卸载,或者再次运行安装文件,就会有卸载选项。

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