退格键功能是什么

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select * from tbl_Articles WHERE ArticleID=1254728 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1254728 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1254728 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1095550,1091125,1091617,1297450,1084649,1085352,1107501,1083055,1081973,1116545,1114772,1088776,1088481,1101749,1082926,1091253,1117744,1125391,1104581,1087399,1099889,1084839,1107975,1107315,1107933,1112080,1110442,1085778,1118304,1094101) ORDER BY field (ArticleID,1095550,1091125,1091617,1297450,1084649,1085352,1107501,1083055,1081973,1116545,1114772,1088776,1088481,1101749,1082926,1091253,1117744,1125391,1104581,1087399,1099889,1084839,1107975,1107315,1107933,1112080,1110442,1085778,1118304,1094101)