Concatenate Strings and Filter Non-NULL Values

Postgres Engine
Database Schema
Question (#11)
List the full_name of patients who have any allergy (allergies IS NOT NULL). full_name is first_name and last_name joined by one space in a single column.
Expected Output
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Databases & Questions
Hint
Same idea as the previous exercise (Q10), but this time you want the rows where a value exists.
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