什么是三个代表

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select * from tbl_Articles WHERE ArticleID=790648 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=790648 LIMIT 0,1
select * from tbl_Articles_sphinx where id=790648 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1101099,1211507,1122236,1104171,1102252,999997,1104344,1105379,1155455,1104637,86153,1866650,1179483,1108063,1617281,3236695,948320,827838,1117866,1106440,784694,1025370,636578,447313,387602,3462309,1116553,2618788,680687,1114422) ORDER BY field (ArticleID,1101099,1211507,1122236,1104171,1102252,999997,1104344,1105379,1155455,1104637,86153,1866650,1179483,1108063,1617281,3236695,948320,827838,1117866,1106440,784694,1025370,636578,447313,387602,3462309,1116553,2618788,680687,1114422)