You can see the officially enabled set of features per Visual Studio edition on the Compare Offerings page of the Visual Studio website.
A note on CodeLens + SSDT in particular: CodeLens was not officially supported as part of Visual Studio 2015 Community, nor is it supported in Visual Studio 2017. While some earlier versions of the SSDT installer for Visual Studio 2015 may have enabled the feature this was an error fixed in later updates. The official policy is that CodeLens is available in Visual Studio Professional and higher editions.
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
