Answer:
To display the productname, category, price, and description length for all heels in the database, we can use the following SQL query:
SELECT productname, category, price, CHAR_LENGTH(description) AS descriptionlength
FROM products
WHERE category = 'heels';
This query will retrieve all products with 'heels' as their category from the products table, and display the productname, category, price, and number of characters in the description column as the last column, which we've aliased as 'descriptionlength'. This information can be used to compare the length of descriptions for different heel products and make informed purchasing decisions.