change Unknown column type to string

hi every one . i use list file node to read 31 excel file together .afteri read that 31 file ; format of some column change to ? . how i can convert types to string??
i use string() method in string manipulation node but not work .
thanks


and result :point_down:

Hi @alrz

Check out the Column Auto Type Cast node. And see if it works for you.
gr. Hans

4 Likes

Hi @alrz

The other option is to set column type manually in Excel Reader node, Transformation tab.
Happy KNIMEing,
Kaz

2 Likes

hi @HansS
thanks a lot . :+1:

1 Like

hi @Kazimierz
yes This also worked .
thanks

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