I will debug sql queries and fix data quality issues

Are your SQL queries returning incorrect results, producing duplicate records, or failing because of join, filtering, or aggregation issues?

I can help you investigate and fix SQL logic problems with a focus on correctness, readability, and reliable data.

What I can help with

• SQL query debugging
• Incorrect JOIN and aggregation results
• Duplicate records and data-quality issues
• Window functions, CTEs, and subqueries
• Query refactoring and basic optimization
• Validation queries and test cases

What you will receive

• Corrected SQL query or queries
• Explanation of the identified issue
• Test cases or validation queries appropriate to the problem
• Clear notes on assumptions and limitations

My approach

1. Understand the expected output and current behavior.
2. Review the SQL and relevant schema details.
3. Identify the likely root cause.
4. Implement and validate a targeted correction.
5. Explain the changes and any remaining limitations.

Before ordering

Please share your SQL dialect, relevant table schemas, sample or synthetic data, expected output, and actual output or error message.

Please do not share passwords, credentials, or confidential production data.

Complex performance investigations, large migration