什么是下划线符号

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1090430,3404928,3059780,416852,1043123,1071795,995020,1194760,1074062,1032667,1084506,3133415,3242124,1094104,2130060,3309997,2212955,1053594,3088594,1074903,2488853,1143171,710811,1050624,3273398,765587,1088704,719778,2019686,1079416) ORDER BY field (ArticleID,1090430,3404928,3059780,416852,1043123,1071795,995020,1194760,1074062,1032667,1084506,3133415,3242124,1094104,2130060,3309997,2212955,1053594,3088594,1074903,2488853,1143171,710811,1050624,3273398,765587,1088704,719778,2019686,1079416)