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Editorial Team
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Asked: 2026-05-30T17:30:04+00:00

I am using NHibernate for my database management. In one class I am calculating

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I am using NHibernate for my database management.
In one class I am calculating a property using this formula:

(SELECT MIN(x.timestamp) FROM (SELECT MAX(r.Timestamp) AS timestamp, r.Meter_Id FROM Reading r, Meter m WHERE r.Meter_Id = m.Id AND m.Store_Id = Id GROUP BY r.Meter_Id) AS x)

The generated query looks like this:

(SELECT MIN(x.timestamp) FROM (SELECT MAX(r.Timestamp) AS timestamp, r.Meter_Id FROM Reading r, Meter m WHERE r.Meter_Id = m.Id AND m.Store_Id = this_.Id GROUP BY r.Meter_Id) AS this_.x)

Obviously the name in the AS statement is renamed to this_.x, which causes the error.

It seems to be a known bug: NHibernate JIRA #NH-2878

Does enyone have a solution for this?

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  1. Editorial Team

    I could be mistaken, but I don’t actually see why you need the alias in that particular formula.

    In a more general sense, you have a few options:

    • Work around the issue. You could use a stored procedure, or load more data and do the calculation in-memory.
    • Fix it. NHibernate is open source — pull down the code, find the cause, isolate it in a test, fix it, and send a pull request.
    • Get someone else to fix it. If your company is using NHibernate and this is important to them, they could probably sponsor another NHibernate contributor to implement a fix.
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