refactor 571

Author: fishercoder1534

Diff for: database/_571.sql

@@ -1,25 +1,3 @@
---571. Find Median Given Frequency of Numbers
--- The Numbers table keeps the value of number and its frequency.
---
---+----------+-------------+
---|  Number  |  Frequency  |
---+----------+-------------|
---|  0       |  7          |
---|  1       |  1          |
---|  2       |  3          |
---|  3       |  1          |
---+----------+-------------+
---
---In this table, the numbers are 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 2, 3, so the median is (0 + 0) / 2 = 0.
---
---+--------+
---| median |
---+--------|
---| 0.0000 |
---+--------+
---
---Write a query to find the median of all numbers and name the result as median.
-
 select FORMAT(avg(n.Number),4)*1.0 as median
 from Numbers n left join
 (