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– Can i use hourly and daily partitions together?
Not in the same HDB, see here:
14. Introduction to Kdb+ – Q for Mortals (kx.com)
If you are looking to change from hourly to daily partitions, you could move your older partitions to a separate database and merge them into dates. You would then have to query this database separately. Or you can look at converting all of your existing database into daily partitions