问题描述:

I'm evaluating Yesod as a platform for writing a web-based accounting software for in-house use. So far I'm impressed.

Modelling the entities to suit Persistent is pretty straight-forward, being able to set column names helps greatly as the database with accounting entries already exists.

However I will need to eventually run queries that aggregate the data also, ie. give me the balance for this account. Can this be expressed within Persistent?

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