sql - msg 175, The isnull function requires 2 arguments(s) -


after looking @ similar issues i'm no wiser. have value returning has 2 sets of numbers name i.e. (xxxx;xxxx;name). i'm trying return name. original code i've written (below) works if name value/name present. 

select     substring(field_value,75, len (field_value))      [rwadmin].[rv_activity_fields] p join      [rwadmin].[rw_association] on p.activity_id = a.activitya_id

however breaks report if value blank returns "null",

so i've thought work, above error.

select     isnull(substring(field_value,75, len (field_value)))      [rwadmin].[rv_activity_fields] p join      [rwadmin].[rw_association] on p.activity_id = a.activitya_id

help please.

isnull takes expression , value replace null values. check expression value, if null returns value provided nulls , if not returns expression value, if want return blank when null should use way:

isnull(substring(field_value,75, len (field_value)), '')

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