SQL Query Correction and Optimization

Issue Identification

The provided SQL query contains the following issues:

1. A trailing comma in the GROUP BY clause.
2. Inconsistency in column naming conventions and aliases.

Corrected SQL Query

Below is the corrected version of the SQL query with the above issues rectified.

SQL

SELECT 
    Member_Club AS member_club, 
    MemberProduct AS member_product, 
    COUNT(ID) AS member_count, 
    MONTH(CreatedDateTime) AS month_created, 
    YEAR(CreatedDateTime) AS year_created,
    LEFT(LinkedPatrolUnit, 5) AS towbyunit
FROM 
    [EDW].[RS].[FactRoadServiceJobs]
WHERE 
    BKDateKey BETWEEN '20171101' AND '20241231'
    AND JobServiceCategory = 'tow'
    AND PatrolUnit LIKE '5MT%'
    AND JobStatus = 'COMPLETED'
GROUP BY 
    YEAR(CreatedDateTime), 
    MONTH(CreatedDateTime), 
    MemberProduct, 
    Member_Club,
    LEFT(LinkedPatrolUnit, 5)
ORDER BY 
    year_created, 
    month_created;

Explanation

1. Trailing Comma in GROUP BY: Removed the trailing comma in the last line of the GROUP BY clause to prevent syntax errors.
2. Column Naming Conventions: Ensured consistent use of aliases for readability and maintainability of the SQL query.

Usage Example

To run this query in a typical SQL environment (e.g., SQL Server Management Studio, Azure SQL Database), you can use the following steps:

1. Open the Query Editor in your preferred SQL management tool.
2. Copy and Paste the Corrected SQL Query into the editor.
3. Execute the Query to retrieve the desired aggregation of the FactRoadServiceJobs table data.

Additional Considerations

• Ensure the date format in BKDateKey matches the expected format in your database.
• Validate that the LEFT function is supported in your SQL dialect (the query assumes SQL Server).

For a more detailed understanding and advanced SQL optimization techniques, you might consider exploring the courses offered on the Enterprise DNA platform.