I have installed Glimpse on visual studio 2012 but i can't see the SQL part in the Glimpse .
You need to install the Glimpse.Ado NuGet package as well as it contains the necessary SQL related hooks.
If you are using Entity Framework then you can install one of the following NuGet packages
The Glimpse.EFx NuGet packages will automatically install the Glimpse.Ado NuGet package as it depends on it.