[Orgmode] Org Mode spreadsheet SUMIF

[Jeff Kowalczyk]

(Apologies if this is a FAQ, a gmane.org search of this list did not return any
matches)

What is the Org Mode spreadsheet formula idiom for a SUMIF function?

The objective is to add up the numeric values for rows matching a tag column:

| 2010-03-01 | 12.2 | foo |
| 2010-03-02 | 11.5 | foo |
| 2010-03-02 | 12.6 | bar |
| 2010-03-03 | 10.2 | foo |

Need a total for foo: 33.9, and bar: 12.6, etc.

I'll probably use a remote table reference for the summary formulas.

Thanks,
Jeff