<ul><li>A certain database table records the execution status of a project, with multiple people participating in the project every day.</li><li>The task is to calculate the number of people who have also participated in the project the previous day, grouped by date.</li><li>SQL grouping does not allow retention of subsets, making it difficult to calculate the intersection of adjacent subsets.</li><li>SPL (Structured Process Language) allows direct retention of subsets and calculation of intersections, making the task easier to implement.</li></ul>

Calculate the Number of Intersections between Adjacent Subsets after Grouping — From SQL to SPL #14

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