The Battle of Grand Gulf was fought on April 29, 1863, during th: In spatially enabled databases (such as IBM Db2, IBM Informix, Ingres, Microsoft SQL Server, MonetDB, MySQL, Oracle RDBMS, Teradata, PostGIS, SQL Anywhere and Vertica), SRIDs are used to uniquely identify the coordinate systems used to define columns of spatial data or individual spatial objects in a spatial column (depending on the spatial implementation).  SRIDs are typically associated with a well-known text (WKT) string definition of the coordinate system (SRTEXT, above).