#34798: Using Django 4.2 with MSSQL 2019 Aggregation Containing Subquery Fails
-------------------------------------+-------------------------------------
Reporter: haldunk | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 4.2
layer (models, ORM) | Keywords: MSSQL, Aggregation,
Severity: Normal | Subquery
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Aggregation in a query employing a subquery expression fails with the
following error:
ProgrammingError: ('42000', '[42000] [Microsoft][ODBC Driver 17 for SQL
Server][SQL Server]Cannot perform an aggregate function on an expression
containing an aggregate or a subquery. (130) (SQLExecDirectW)')
To generate the error for following example can be used:
{{{
#!python
class Exchange(models.Model):
date = models.DateField()
value = models.FloatField()
class Invoice(models.Model):
date = models.DateField()
gross = models.FloatFlied()
exchange =
Subquery(Exchange.objects.filter(date__lte=OuterRef('date')).order_by('-date').values('value')[:1])
Invoice.objects.annotate(
exchange=exchange,
gross_currency=F('gross') / F('exchange')
).aggregate(
avg_gross_currency=Avg('gross_currency')
)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/34798>
Django <https://code.djangoproject.com/>
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