Select from following answers:- Ram, Shyam, Jadhu, Madhu

- Madhu,Jadhu,Shyam,Ram
- NULL
- Error
- All Above
Since all are strings, so the result will be the concatenation of all those rows i.e. Ram, Shyam, Jadhu, Madhu.However, the CONCAT function ignores the NULL and henceforth, the value will be Ram, Shyam, Jadhu, Madhu and not NULL
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