Hello @minh tran ,
Welcome to Microsoft Q&A forum.
You can follow this document: SSDT for Visual Studio (VS) 2015 and download SSDT for VS 2015, then open the ISO image and run the SSDTSetup.exe file to install IS features for VS 2015. After that you can create a new IS project in VS.
Besides, you may also need to install Microsoft SQL Server Data Tools
component in VS 2015.
Best Regards,
Tianyu
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