常开常闭什么意思

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select * from tbl_Articles_sphinx where id=668263 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(428709,405832,1090438,407732,386161,390001,436054,406791,3512379,426100,432664,403481,1091705,100801,1093358,421453,376462,463745,387272,448889,401352,465194,453227,1112316,430416,415052,1094757,393942,457955,371939) ORDER BY field (ArticleID,428709,405832,1090438,407732,386161,390001,436054,406791,3512379,426100,432664,403481,1091705,100801,1093358,421453,376462,463745,387272,448889,401352,465194,453227,1112316,430416,415052,1094757,393942,457955,371939)