There may be no SQL events in a Timeline snapshot if it was taken during an attach session

As a temporary workaround you can manually create:

• ":Path" variable under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\BidInterface\Loader registry key and set it's value to "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\AdoNetDiag.dll"
• ":Path" variable under HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\BidInterface\Loader registry key and set it's value to "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AdoNetDiag.dll"

and then restart the profiled process.