Hi,
please look at http://www.sqlite.org/faq.html#q26
There is IMHO mistake (which leads to confusion), because Firebird does not follow same logic as SQLite.

Firebird: "Multiple rows having the /same subset/ of UK columns |NULL| and the rest filled with regular values and those regular values are the /same/ in every column, are forbidden."
http://www.firebirdsql.org/file/documentation/reference_manuals/reference_material/html/langrefupd25-ddl-table.html#langrefupd25-ct-unique-keys

If I am true, can somebody correct it.
Thanks
L.
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