车次前面的D G C 代表什么

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select * from tbl_Articles WHERE ArticleID=84089 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=84089 LIMIT 0,1
select * from tbl_Articles_sphinx where id=84089 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1104673,980999,1128153,1106781,1129143,1117550,1122683,1121808,1117413,1122962,1124971,1103514,1125009,1126526,1125550,1129369,1128103,1098709,1062542,1045909,1108536,1124027,1103730,1114118,1043770,1123877,1065867,1113948,1106769,1113916) ORDER BY field (ArticleID,1104673,980999,1128153,1106781,1129143,1117550,1122683,1121808,1117413,1122962,1124971,1103514,1125009,1126526,1125550,1129369,1128103,1098709,1062542,1045909,1108536,1124027,1103730,1114118,1043770,1123877,1065867,1113948,1106769,1113916)