Advanced SQL Scenario-Based Questions (Top Priority)

These are common for 8–15 years experience.

Examples:

Q1: Find consecutive login days for users.

Topics:

• LAG()
• Date calculations
• Gap analysis

Q2: Find customers who purchased in 3 consecutive months.

Topics:

• Window functions
• Date logic

Q3: Detect missing invoice numbers.

Topics:

• LEAD()
• Sequence analysis

Q4: Find longest employee tenure in each department.

Topics:

• DENSE_RANK()
• Date functions

Q5: Find products contributing to 80% of revenue.

Topics:

• Running totals
• Pareto analysis