I will review, debug and improve your sql or pl sql code

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Mario C

About this gig

Do you have a slow SQL query, a PL/SQL script throwing errors, or a database process that is not performing as expected? I can fix it quickly and professionally.


I am a Computer Engineer with 11+ years of experience working with SQL, PL/SQL, Oracle databases, performance tuning, debugging and QA.

What I can do for you:

  • Fix SQL or PL/SQL errors
  • Optimize slow queries and improve performance
  • Rewrite inefficient logic for better execution time
  • Debug stored procedures, functions and triggers
  • Validate data logic and correct inconsistencies
  • Add clear comments and explanations to your code
  • Provide recommendations to improve your database structure

Why choose me:

  • 11 years of real industry experience
  • Fast delivery and clear communication
  • Clean, readable and wellcommented code
  • Professional debugging and performance tuning
  • I work with Oracle, SQL Server, MySQL and PostgreSQL

What you will receive:

  • Corrected and optimized SQL/PLSQL code
  • Explanation of the issue and how it was fixed
  • Optional performance recommendations
  • Support for small adjustments after delivery


If you need a quick fix, a deep optimization, or a full review of your SQL/PLSQL logic, Im here to help.

Get to know Mario C

Mario C

Senior Quality Assurance Tester

  • FromSpain
  • Member sinceOct 2026
  • Avg. response time1 hour
  • Languages

    Spanish, English
I am a Senior QA Tester with strong expertise in SQL, PLSQL, and Java. My background in programming provides a significant advantage to my testing capabilities, allowing me to adapt easily to new languages and environments. I have extensive experience in ETL testing with DataStage, CRM development, and Business Intelligence reporting.