Rich Shepard wrote:
On Mon, 2 Oct 2006, Eric Matthew Finnin wrote:
Could someone tell me the syntax for the .import command? I can't
seem to
get my null values to be recognized.
.nullvalue STRING Print STRING in place of NULL values
If you type '.h' you'll see the syntax of all the commands.
Rich
Rich and Eric,
The .nullvalue command won't work. It only affects the way the sqlite
shell handles null values on output. In fact there is no direct way to
insert NULL values into a table using the .import command. It reads all
its input as strings, and the closest you can get is a empty string (by
placing two separators back to back) which isn't the same as a null
values. It doesn't use the .nullvalue string on input.
If you know that the string 'NULL' does not appear in your valid data,
you can use a series of update statements to replace that string with
real null values. You could, of course, use any other string as a
sentinel value to hold the place of your NULLs.
.import test1.csv test1
update test1 set col2 = NULL where col2 = 'NULL';
update test1 set col3 = NULL where col3 = 'NULL';
Or you could modify the source of the .import command so that it does
recognize the .nullvalue string on input, and binds a null value for
that column. If you do you should submit a patch, others may find this
useful.
HTH
Dennis Cote
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