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search formats:"=MOBI" & isbn:true and...
Hi ! Calibre 0.7.46 XP SP3
i tried to search
formats:"=MOBI"
OK, total MOBI ebook 1465 - the same i calculated by file manager and shown by Calibre Formats left column menu
formats:"=MOBI" & isbn:true
762 ebooks
formats:"=MOBI" & isbn:
782 ebooks ! not 762 as expected
formats:"=MOBI" & not isbn:true
20 ebooks ! ( i expected 703 = 1465-762 or 683 = 1465-782)
formats:"=MOBI" & isbn:false
20 ebooks !
what wrong with my thought ? some isbn data are not true but exist ? how to clear ? how to see MOBI which does not have isbn for sure ?
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