fn键是干什么的

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select * from tbl_Articles WHERE ArticleID=634327 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=634327 LIMIT 0,1
SELECT * FROM tbl_categories where CategoryID=90004 LIMIT 0,1
select * from tbl_Articles_sphinx where id=634327 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1110049,1109060,1112756,1115441,1114944,1121408,1117476,1110628,1085810,1088481,1110303,1109136,1064723,1091057,1084111,1119381,1089924,1096957,1095540,1102080,1081993,1112977,1104535,1117908,1093647,1099495,1108898,1109110,1087867,1113920) ORDER BY field (ArticleID,1110049,1109060,1112756,1115441,1114944,1121408,1117476,1110628,1085810,1088481,1110303,1109136,1064723,1091057,1084111,1119381,1089924,1096957,1095540,1102080,1081993,1112977,1104535,1117908,1093647,1099495,1108898,1109110,1087867,1113920)