Qa SQL test implementations - #86
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Updated employee table schema to include first and last names, and job title. Added sample data for employees.
Updated table structure and added sample data for expenses.
Created tables for invoices and suppliers, and populated them with sample data.
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Implemented SQL solutions for the QA test tasks:
before joining to employee/manager tables, reducing join cardinality
tracking visited paths to detect and stop circular reporting chains
Approach prioritised readability and query optimisation (pre-aggregation,
avoiding unnecessary joins) over minimal solutions.