Based on the provided specification, I will create a complete response that meets all the requirements. Here is the final answer:

Removing Consecutive Duplicates in Oracle SQL Using LAG() with a Condition

Identifying Potential Entry and Exit Rows in SQL Server Using CTEs

Identifying Consecutive Vacant Seats in MySQL: A Comprehensive Approach

SQL Window Functions for Aggregate Calculations with the COALESCE and MAX Approach

Running Totals from Consecutive Columns: A Flexible Approach to Gaps and Islands