#30056: Add SQLite support for StdDev() and Variance()
-------------------------------------+-------------------------------------
Reporter: Nick Pope | Owner: nobody
Type: New | Status: new
feature |
Component: Database | Version: 2.1
layer (models, ORM) | Keywords: sqlite, stddev,
Severity: Normal | variance, statistics
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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`StdDev()` and `Variance()` are currently supported for SpatiaLite, but
not SQLite. Django's documentation highlights that there is an extension
module available that provides support, but there are problems with this
suggestion:
- This extension module is not provided compiled and only implements
`STDDEV` and `VARIANCE`.
- Django uses `STDDEV_POP` and `STDDEV_SAMP` for `StdDev()`; `VAR_POP` and
`VAR_SAMP` for `Variance()` - so they wouldn't work anyway.
As an alternative, we can make use of the `statistics` module added to the
standard library in Python 3.4.
--
Ticket URL: <https://code.djangoproject.com/ticket/30056>
Django <https://code.djangoproject.com/>
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