It really depends on how your datastore coughs up the data. I don't believe
there is a true NULL with DBF files but I may be wrong. You might try
expressions like:
EXPRESSION (not '[tx_femme]')
EXPRESSION ('[tx_femme]' = '')
Steve
>>> Emmanuel BELO <[EMAIL PROTECTED]> 03/06/06 9:11 AM >>>
Hi,
how do you handle NULL values from you database in your mapfile's
expression?
Example (NULL value for some tx_femme):
CLASS
EXPRESSION (([tx_femme] > 8) AND ([tx_femme] <= 15))
NAME "8 - 15"
STYLE
COLOR 255 217 0
END
END
I've tried:
EXPRESSION ('[tx_femme]' = 'NULL')
EXPRESSION /_always_false_/
Best regards,
Emmanuel BELO
