Grokking SQL for Tech Interviews
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4. Biggest Single Number
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Problem

Table: MyNumbers

+-------------+------+
| Column Name | Type |
+-------------+------+
| num         | int  |
+-------------+------+
This table may contain duplicates (In other words, there is no primary key for this table in SQL).
Each row of this table contains an integer.

Problem Definition

A single number is a number that appeared only once in the MyNumbers table.

Find the largest single number. If there is no single number, report null.

Example

Output

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