I will fix sql query errors and optimize performance

SQL Query Debugging & Troubleshooting

Are you getting incorrect results, slow performance, duplicate rows, missing records, or SQL errors?

I will investigate your SQL query, identify the root cause, and provide a clear explanation along with recommendations or a corrected query.

Services include:

• SQL query debugging
• SQL error troubleshooting
• Query optimization
• Performance analysis
• JOIN troubleshooting
• WHERE and HAVING clause validation
• GROUP BY and aggregation analysis
• NULL and duplicate record analysis
• Data validation and reconciliation
• Execution plan review
• Root cause analysis
• Before-and-after SQL comparison

I can help with:

• Incorrect query results
• Missing or duplicate records
• Slow-running queries
• Incorrect JOIN logic
• Aggregation issues
• Filter and WHERE clause problems
• Performance bottlenecks
• Data inconsistencies

Supported databases:

• Oracle
• SQL Server
• DB2
• MySQL
• PostgreSQL
• Snowflake

You'll receive:

• A clear explanation of the issue
• Root cause analysis
• Optimized or corrected SQL (when applicable)
• Recommendations for improving performance and accuracy

I focus on delivering practical, easy-to-understand solutions so you can resolve SQL issues quickly and confidently.