Data dictionary Oracle Database related data dictionary topics. SQL types mapping: Oracle databaseBOOLEAN data typeCHAR and VARCHAR data typesNumeric data typesDATE and DATETIME data typesINTERVAL data typeSERIAL and BIGSERIAL data typesROWID columnsThe RAW data typeTEXT and BYTE (LOB) typesSQL table definitionName resolution of SQL objectsNULLs in indexed columns