I wrote it like this, hoping it can't be null or "", but it doesn't work properly.
If I write !=NULL then it is right. If I write !=NULL and !="", it is incorrect and very strange.
I wrote it like this, hoping it can't be null or "", but it doesn't work properly.
If I write !=NULL then it is right. If I write !=NULL and !="", it is incorrect and very strange.
You have to use Unary Test syntax.