previous是什么意思

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select * from tbl_Articles WHERE ArticleID=430650 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=430650 LIMIT 0,1
select * from tbl_Articles_sphinx where id=430650 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(385297,1118705,363497,430558,497890,1109683,1098681,415052,3418318,1119920,1106148,457955,479933,435807,466149,1117866,1303492,420660,460504,1120896,385619,1098733,478132,1100443,494399,1107679,486279,1084541,436892,386283) ORDER BY field (ArticleID,385297,1118705,363497,430558,497890,1109683,1098681,415052,3418318,1119920,1106148,457955,479933,435807,466149,1117866,1303492,420660,460504,1120896,385619,1098733,478132,1100443,494399,1107679,486279,1084541,436892,386283)