感叹号的用法是什么

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select * from tbl_Articles WHERE ArticleID=1821952 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1821952 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1821952 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(533907,364450,1113323,1119401,1122603,490000,1119694,426358,1117834,1089652,1091029,161621,1109685,492771,1103123,478570,532024,1109905,1092862,1096969,459660,441451,1119488,1121122,434782,1090378,614611,1111692,385299,583842) ORDER BY field (ArticleID,533907,364450,1113323,1119401,1122603,490000,1119694,426358,1117834,1089652,1091029,161621,1109685,492771,1103123,478570,532024,1109905,1092862,1096969,459660,441451,1119488,1121122,434782,1090378,614611,1111692,385299,583842)