Watch 10 video solutions for Biggest Single Number, a easy level problem involving Database. This walkthrough by NeetCode has 117,991 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
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.
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.
The result format is in the following example.
Example 1:
Input: MyNumbers table: +-----+ | num | +-----+ | 8 | | 8 | | 3 | | 3 | | 1 | | 4 | | 5 | | 6 | +-----+ Output: +-----+ | num | +-----+ | 6 | +-----+ Explanation: The single numbers are 1, 4, 5, and 6. Since 6 is the largest single number, we return it.
Example 2:
Input: MyNumbers table: +-----+ | num | +-----+ | 8 | | 8 | | 7 | | 7 | | 3 | | 3 | | 3 | +-----+ Output: +------+ | num | +------+ | null | +------+ Explanation: There are no single numbers in the input table so we return null.
