Argument data type numeric is invalid for argument 1 of substring function

问题

I get the following message with this code

case when substring(New_Limit,11,1)=' ' then '0'+substring(New_Limit,1,10)

The 'then' bit is meant to concat the 0 and substring. Any help?

回答1:

This means that your New_Limit variable is a numeric value. You may want to put a CAST to (n)varchar around it.

回答2:

You try to cast it to a string type (varchar) first:

SUBSTRING(CAST(New_Limit AS varchar(38)), 11, 1)

来源：https://stackoverflow.com/questions/13647370/argument-data-type-numeric-is-invalid-for-argument-1-of-substring-function