ClickHouse ® tips #1: calculating aggregations after a date

The text discusses a method for calculating the sum of amounts from previous and following days for a specific date in a table, using the example of the date 2020-01-05. It suggests utilizing the function arrayCumSum along with other array techniques to efficiently calculate these sums without needing to compute the values repeatedly for each day. The author implies there might be a simpler method to achieve the same result but is unsure of what that might be. The text points to a snapshot for a detailed, step-by-step explanation of the approach.