| Tracks the parentage which regions contribute to which boxes |
| For the sector computation, Region2Box tracks the parentage of which regions contribute to which boxs. TileRegions contribute to TileBoxes TileRegions and TileBoxes contribute to SkyBoxes Wedges and SkyBoxes contribute to Sectorlets Sectorlets contribute to Sectors |
| Index Type | Key or Field List |
| primary key | regionType, id, boxID |
| foreign key | Region(regionID) |