On 16 Mar 2016, at 9:02am, Simon Slavin <slavins at bigfraud.org> wrote:

> No.  Use one of these two methods.

I'm sorry.  I read your 'import' but I thought you meant using INSERT.  If you 
are using the shell's ".import" command then Clemens is right.  You are 
importing from a text file, and there is no way to put a NULL in a text file. 
After your import you should do something like

UPDATE t SET b=NULL WHERE b='NULL';

Simon.

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