[Qgis-user] String length in the Query Builder

[Zirneklitis]

Hi,

Is it possible to determine the length of a text string in the Query 
Builder?

I want to create filter for a shape file to show only those records 
where the given content of the field is more than 3 characters. The 
standard SQL functions LENGTH or LEN ar not recognized by QGIS. :(

Thank you,
Karlis