Distinct molecules called agglutinogens (a type of antigen) are attached to the surface of red blood cells. There are two different types of agglutinogens, type A and type B. Each type has different properties.
MDB: Geodatabase. The geodatabase is a collection of geographic datasets of various types, with the most basic types being vector, raster, and tabular data. There are three types of geodatabases: file, personal, and ArcSDE. Geodatabases are the native data format for ESRI's ArcGIS.
SQL expressions are used in many parts of ArcGIS and its extensions to define a subset of data on which to perform some operation. You use it in ArcMap to select features with the Select by Attributes dialog box or with the Query Builder dialog box to set a layer definition query. You use it in geoprocessing to define a subset of features or records to perform an operation on. You also use SQL to select features programmatically.