Thanks!! However , I want to replace value of src = ? to unknown and for that I wrote the expression as like this:
if(isnull(src) OR src="?","unknown",src) ; however it is taking the value but it replaces all other src values to unknown too. e.g if src = 172.*.*.* any IP address; it also replaces to unknown.
I tried with other way also ; but same result I am getting.
if(isnull(src) OR src=="\?","unknown",src)
if(isnull(src) OR src=="?","unknown",src)
Basically, I want only value "?" should be replaced with unknown.
If anyone can tell, it would be really help. Thanks in advance.
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