Fixes: Wrong SQL Query's are fixed now

[CodeMaverick2]

Description

Fixes - #28798

This PR addresses issues in the SQL queries presented in the Databases and SQL lesson. The following corrections have been made to ensure compliance with SQL standards:

1. Updated First Query:

   • The GROUP BY clause now includes users.name alongside users.id to conform to SQL standards regarding the inclusion of non-aggregated columns in the GROUP BY statement.

   Before:

   SELECT users.id, users.name, COUNT(posts.id) AS posts_written
   FROM users
   JOIN posts ON users.id = posts.user_id
   GROUP BY users.id;

   After:

   SELECT users.id, users.name, COUNT(posts.id) AS posts_written
   FROM users
   JOIN posts ON users.id = posts.user_id
   GROUP BY users.id, users.name;

2. Updated Second Query:

   • The HAVING clause now uses the aggregate function directly rather than the alias posts_written, which ensures that the query executes correctly.
   • The GROUP BY clause is also updated to include users.name.

   Before:

   SELECT users.id, users.name, COUNT(posts.id) AS posts_written
   FROM users
   JOIN posts ON users.id = posts.user_id
   GROUP BY users.id
   HAVING posts_written >= 10;

   After:

   SELECT users.id, users.name, COUNT(posts.id) AS posts_written
   FROM users
   JOIN posts ON users.id = posts.user_id
   GROUP BY users.id, users.name
   HAVING COUNT(posts.id) >= 10;

Impact

• Improved Learning Experience: Correcting these SQL queries aligns them with standard SQL practices, enhancing the educational value of the lesson.

[JoshDevHub]

Closed for stepping over the issue author