SQL Server: Insert if column values are null

Question

I am newbie to SQL queries so sorry for this basic question.

I want to insert values into a table where column's value is null

I tried following

INSERT INTO SystemUsers(FilePath)
If @FilePath IS Null
values('C:\Users\Developer\Desktop\MvcApplication8\MvcApplication8\App_Data\Uploads\Lighthouse.jpg')

and

INSERT INTO SystemUsers(FilePath)
where FilePath IS Null
values('C:\Users\Developer\Desktop\MvcApplication8\MvcApplication8\App_Data\Uploads\Lighthouse.jpg')

But that didn't work, how can I insert default values in a column whether column's values are null?

Answer 1

Maybe what you want is the UPDATE command and not the insert something like this

UPDATE SystemUsers
SET FilePath = 'C:\Users\Developer\Desktop\MvcApplication8\MvcApplication8\App_Data\Uploads\Lighthouse.jpg'
WHERE FilePath is null

Answer 2

UPDATE SystemUsers
    SET FilePath = 'C:\Users\Developer\Desktop\MvcApplication8\MvcApplication8\App_Data\Uploads\Lighthouse.jpg'
WHERE FilePath is null

Where clause normaly comes after the operation you are doing.