什么是数据分组?数据分组的方式有哪几种?

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select * from tbl_Articles WHERE ArticleID=1043012 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1043012 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1043012 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(794334,1155442,2181133,3167707,722480,790019,1161001,1139975,1986583,1003542,1759220,469717,359460,419985,410048,1148025,1075020,427635,578972,802509,461935,2917267,1945791,923647,789012,821029,2089760,700081,584280,793243) ORDER BY field (ArticleID,794334,1155442,2181133,3167707,722480,790019,1161001,1139975,1986583,1003542,1759220,469717,359460,419985,410048,1148025,1075020,427635,578972,802509,461935,2917267,1945791,923647,789012,821029,2089760,700081,584280,793243)