Table number contains many numbers in column num including duplicated ones.
Can you write a SQL query to find the biggest number, which only appears once.

+---+

|num|

+---+

| 8 |

| 8 |

| 3 |

| 3 |

| 1 |

| 4 |

| 5 |

| 6 |

For the sample data above, your query should return the following result:

+---+

|num|

+---+

| 6 |

Note:
If there is no such number, just output null.

Code

SELECT MAX(num) as num FROM (SELECT num FROM number GROUP BY num HAVING COUNT(num) = 1) AS t

# note : have to has AS t

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