I want to delete ALL blank observations from a data set.
I only know how to get rid of blanks from one variable:

```
data a;
set data(where=(var1 ne .)) ;
run;

```

Here I set a new data set without the blanks from var1. 
But how to do it, when I want to get rid of ALL the blanks in the whole data set?

Thanks in advance for your answers.