delete键是什么意思

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select * from tbl_Articles WHERE ArticleID=2721587 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2721587 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2721587 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1065437,752873,2590186,743911,3447399,1180123,426212,3354400,2033673,3279305,1104220,787360,884306,380479,3378736,566671,2735981,833612,2763803,569017,3219403,1099325,660053,1281707,934642,776796,1952382,1094167,3335575,1122584) ORDER BY field (ArticleID,1065437,752873,2590186,743911,3447399,1180123,426212,3354400,2033673,3279305,1104220,787360,884306,380479,3378736,566671,2735981,833612,2763803,569017,3219403,1099325,660053,1281707,934642,776796,1952382,1094167,3335575,1122584)