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Background (Input) The Global Historical Climatology Network has flagged invalid or erroneous data in its collection of weather measurements. After removing these elements, there are swaths of data that no longer have contiguously dated sections. The data resembles: "2007-12-01";14 -- Start of December "2007-12-29";8 "2007-12-30";11 "2007-12-31";7 "2008-01-01";8 -- Start of January "2008-01-02";12 "2008-01-29";0 "2008-01-31";7 "2008-02-01";4 -- Start of February ... entire month is complete ... "2008-02-29";12 "2008-03-01";14 -- Start of March "2008-03-02";17 "2008-03-05";17 Problem (Output) Although possible to extrapolate missing data (e.g., by averaging from other years) to provide contiguous ranges, to simplify the system, I want to flag the non-contiguous segments based on whether there is a contiguous range of dates to fill the month: D;"2007-12-01";14 -- Start of December D;"2007-12-29";8 D;"2007-12-30";11 D;"2007-12-31";7 D;"2008-01-01";8 -- Start of January D;"2008-01-02";12 D;"2008-01-29";0 D;"2008-01-31";7 "2008-02-01";4 -- Start of February ... entire month is complete ... "2008-02-29";12 D;"2008-03-01";14 -- Start of March D;"2008-03-02";17 D;"2008-03-05";17 Some measurements were taken in the year 1843. Question For all weather stations, how would you mark all the days in months that are missing one or more days? Source Code The code to select the data resembles: select m.id, m.taken, m.station_id, m.amount from climate.measurement Related Ideas Generate a table filled with contiguous dates and compare them to the measured data dates. <a href="https://stackoverflow.com/questions/75752/what-is-the-most-straightforward-way-to-pad-empty-dates-in-sql-results

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