On a somewhat related note: the OpenType (OT) font format specifies 55 different "tables". These are not really what would be a table in a database but more like sections that may have multiple tables. E.g. the "math" OT table has constants, glyph info, italic corrections, top accent attachment, kern info, variants, glyph construction... -- I can't say for sure but I think a hundred tables to properly describe a font is probably a good estimate.