On 1/27/2016 2:10 PM, Yannick Duch?ne wrote:
> `UNIQUE` constraint allows multiple NULL: is this expected?

http://www.sqlite.org/lang_createtable.html
"For the purposes of UNIQUE constraints, NULL values are considered 
distinct from all other values, including other NULLs."

I'm reasonably, but not 100%, sure this is standard-conforming.
-- 
Igor Tandetnik

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