SQL Server-如何在ISNULL中使用转换

Question

Something like the example below:

SELECT SSN, Name, CONVERT(VARCHAR(50), Hours) ISNULL(Hours, '')

where I want to convert an int to varchar and at the same time set the null values as an empty string. How can I do to make this possible?

Answer 1

ISNULL(CONVERT(VARCHAR(50), Hours), '')

Answer 2

An alternative option if you are on 2012+ would be to use

SELECT CONCAT(Hours,'')

which has the same end result of converting to string and returning empty string instead of NULL.

Answer 3

Wrap your convert in the isnull ;

SELECT 
SSN
,Name
,ISNULL(CONVERT(VARCHAR(50), Hours), '')

This way it will allow for the nulls to be pulled on the conversion, you won't be able to do the isnull inside the convert as a zero length character won't be compatible with an int field (or other number only field).