指套的作用

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select * from tbl_Articles WHERE ArticleID=3508731 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3508731 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3508731 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3333839,1162034,525089,854548,1329698,3441060,629268,938562,359056,511039,3511182,1095754,1055508,763969,965531,425349,2395737,436662,1103603,2383832,3494237,3314004,1142927,460442,656707,1109452,821309,1117107,499673,1068888) ORDER BY field (ArticleID,3333839,1162034,525089,854548,1329698,3441060,629268,938562,359056,511039,3511182,1095754,1055508,763969,965531,425349,2395737,436662,1103603,2383832,3494237,3314004,1142927,460442,656707,1109452,821309,1117107,499673,1068888)