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1543. Fix Product Name Format πŸ”’

Description

Table: Sales

+--------------+---------+
| Column Name  | Type    |
+--------------+---------+
| sale_id      | int     |
| product_name | varchar |
| sale_date    | date    |
+--------------+---------+
sale_id is the column with unique values for this table.
Each row of this table contains the product name and the date it was sold.

 

Since table Sales was filled manually in the year 2000, product_name may contain leading and/or trailing white spaces, also they are case-insensitive.

Write a solution to report

  • product_name in lowercase without leading or trailing white spaces.
  • sale_date in the format ('YYYY-MM').
  • total the number of times the product was sold in this month.

Return the result table ordered by product_name in ascending order. In case of a tie, order it by sale_date in ascending order.

The result format is in the following example.

 

Example 1:

Input: 
Sales table:
+---------+--------------+------------+
| sale_id | product_name | sale_date  |
+---------+--------------+------------+
| 1       | LCPHONE      | 2000-01-16 |
| 2       | LCPhone      | 2000-01-17 |
| 3       | LcPhOnE      | 2000-02-18 |
| 4       | LCKeyCHAiN   | 2000-02-19 |
| 5       | LCKeyChain   | 2000-02-28 |
| 6       | Matryoshka   | 2000-03-31 |
+---------+--------------+------------+
Output: 
+--------------+-----------+-------+
| product_name | sale_date | total |
+--------------+-----------+-------+
| lckeychain   | 2000-02   | 2     |
| lcphone      | 2000-01   | 2     |
| lcphone      | 2000-02   | 1     |
| matryoshka   | 2000-03   | 1     |
+--------------+-----------+-------+
Explanation: 
In January, 2 LcPhones were sold. Please note that the product names are not case sensitive and may contain spaces.
In February, 2 LCKeychains and 1 LCPhone were sold.
In March, one matryoshka was sold.

Solutions

Solution 1

Thinking

Product names mix case and stray spaces, and we must total sales by month. Grouping the raw column would split one product into several keys.

Trim and lower-case the name, format the date as year-month, then group by those two columns and count. A CTE performs the cleanup; the outer query only aggregates and sorts.

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# Write your MySQL query statement below
WITH
    t AS (
        SELECT
            LOWER(TRIM(product_name)) AS product_name,
            DATE_FORMAT(sale_date, '%Y-%m') AS sale_date
        FROM Sales
    )
SELECT product_name, sale_date, COUNT(1) AS total
FROM t
GROUP BY 1, 2
ORDER BY 1, 2;

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