display the multiple value in single field in drupal 7 view
You can do this by "Rewrite results" follow the following steps.

1) Edit the first field and exclude it from display.

2) Edit the second field and click on the "Rewrite results"

3) check "Rewrite the output of this field" checkbox.

4) find your fields in the "replacement Patterns" and put it in the textarea like this [field1],[field2]