A probabilistic data structure is generated for efficient query processing using a histogram for unsorted data in a column of a columnar database. In at least some embodiments, the vehicles include frames that are wider near the front and rear sections of the vehicles than within the mid-sections of the vehicles. A supporting part is disposed between the meter housing and the measurement insert housing. The centralized address book can include a plurality of address books and each of the plurality of address books is associated with a corresponding VoIP telephone coupled to the VoIP telephone server. Unlatching is carried out by lifting the latching hooks engaging in the latching grooves while withdrawing the external sleeve of the plug-in connector out of the latching grooves by means of opening hooks.