Can I install SQL Server on Server ESSENTIALS 2012 R2?

If I purchase Server ESSENTIALS 2012 R2 (which includes 25 CAL’s but you can’t purchase them separately or go beyond 25) can I install SQL STANDARD on it?  I have been getting contrary information—some saying that you can’t because there are really no CAL’s on Server Essentials and some saying that you can as long as you limit users to 25 and purchase SQL CAL’s.
Thanks.
b1dupreeAsked:
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Rob LeaverSr. Network & Server EngineerCommented:
You will have to purchase user cals for the SQL users. Unfortunately essentials is not like SBS2008 where the licensing is integrated.
b1dupreeAuthor Commented:
Thanks.  I understand the CAL's but can I install it since Essentials is a DC?
Rob LeaverSr. Network & Server EngineerCommented:
Best practice is that it is not a good idea to run SQL on a DC.  However, I am not aware of any negatives, other than the disclaimers about it being a DC and possible RAM or I/O issues.  Where possible, I would use Express as it is a LOT less expensive and requires fewer resources.

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EugeneZ ZhitomirskySQL SERVER EXPERTCommented:
Q: <can I install SQL STANDARD on it?>
as per MS: A: "yes"
 sql server 2012 can be installed on the  Windows Server 2012 R2 Essentials
more:
Hardware and Software Requirements for Installing SQL Server 2012
https://msdn.microsoft.com/en-us/library/ms143506(v=sql.110).aspx
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