万用表上的字母代表什么意思

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select * from tbl_Articles WHERE ArticleID=2627607 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2627607 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2627607 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1110730,1071607,1378426,1130444,1128185,1062346,1298900,2811177,1078100,1484624,1062364,1068334,1132731,1077695,1082267,1052013,1063467,2710003,1081195,1042020,1470537,1046706,1065841,1129433,1069271,1079063,1062000,1117974,1110067,1066872) ORDER BY field (ArticleID,1110730,1071607,1378426,1130444,1128185,1062346,1298900,2811177,1078100,1484624,1062364,1068334,1132731,1077695,1082267,1052013,1063467,2710003,1081195,1042020,1470537,1046706,1065841,1129433,1069271,1079063,1062000,1117974,1110067,1066872)