Re: CSV files & empty strings

On 20 okt 2009, at 16.15, Raymond O'Donnell wrote:

> On 20/10/2009 05:55, Nate Randall wrote:
>> However, I need some method of "converting" the
>> empty string "" values into NULL values after import, so that I can
>> change the date fields back to date-type.  Any suggestions on how
>> this
>> could be accomplished?
>
> How about:
>
>   update <table> set <column> = null where <column> = '';


You can also do the update and the column data type change in one
fell swoop like so:

ALTER TABLE table_name ALTER COLUMN column_name
SET DATA TYPE DATE USING NULLIF(column_name, '')::DATE;




Sincerely,

Niklas Johansson