SQLazy Tool Automates SQL for Time-Gap-Based Sequence Numbering by Account

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A DEV Community article demonstrates how to solve a SQL grouping problem where sequence numbers must reset when time gaps between records exceed one hour within the same account. The task involves two fields — account number and datetime — and requires assigning incrementing sequence numbers that restart whenever a gap of more than 3,600 seconds is detected. The author uses SQLazy, a visual SQL-building tool, to break the solution into three steps: sorting records, segmenting groups based on the time-gap condition, and computing row-level sequence numbers. SQLazy then automatically compiles these steps into native SQL using window functions such as LAG, SUM OVER, and ROW_NUMBER. The article positions SQLazy as a way to generate complex analytical SQL without writing it manually.

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