Cumulative Distribution
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Given the two tables, write a SQL query that creates a cumulative distribution of the number of comments per user. Assume bin buckets class intervals of one.
Example:
Input:
users table
| Columns | Type |
|---|---|
id |
INTEGER |
name |
VARCHAR |
created_at |
DATETIME |
neighborhood_id |
INTEGER |
sex |
VARCHAR |
comments table
| Columns | Type |
|---|---|
user_id |
INTEGER |
body |
VARCHAR |
created_at |
DATETIME |
Output:
| Columns | Type |
|---|---|
frequency |
INTEGER |
cum_total |
FLOAT |
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