On Fri, Mar 2, 2012 at 13:59, Jay A. Kreibich <j...@kreibi.ch> wrote:
> On Fri, Mar 02, 2012 at 10:44:20AM +0100, Christoph P.U. Kukulies
> scratched on the wall:
>
> Kind of. It implies uniqueness in the SQL sense, which does not
> include NULLs (remember, NULL != NULL).
Actually, NULL != NULL is unknown. Any expression compared to NULL
with any of the operators == != < > <= >= LIKE GLOB will have unknown
result.
C:\> sqlite3
SQLite version 3.7.10 2012-01-16 13:28:40
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> SELECT CASE WHEN NULL = NULL THEN 0
...> WHEN NULL <> NULL THEN 1
...> ELSE 2
...> END;
2
sqlite> .q
--
Benoit Mortgat
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