单位a是什么意思

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select * from tbl_Articles WHERE ArticleID=2934221 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2934221 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2934221 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1305867,1126555,1104923,1119480,1118436,1110221,1129707,1305363,1112738,1130598,1117339,1084213,1125512,1122134,1059497,1090416,1131391,1112510,1129917,1127549,1130876,1107024,1109619,1121230,1110652,1110528,1101423,1117379,1127661,1123487) ORDER BY field (ArticleID,1305867,1126555,1104923,1119480,1118436,1110221,1129707,1305363,1112738,1130598,1117339,1084213,1125512,1122134,1059497,1090416,1131391,1112510,1129917,1127549,1130876,1107024,1109619,1121230,1110652,1110528,1101423,1117379,1127661,1123487)