什么是前级效果器

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(850653,533790,647985,2029011,3249308,941382,3108506,1037027,1070779,3372528,1003728,3259845,364104,919575,2540680,987901,911570,702448,1419790,382824,882972,596738,2194172,504767,933782,739177,1176893,1724611,1452458,953172) ORDER BY field (ArticleID,850653,533790,647985,2029011,3249308,941382,3108506,1037027,1070779,3372528,1003728,3259845,364104,919575,2540680,987901,911570,702448,1419790,382824,882972,596738,2194172,504767,933782,739177,1176893,1724611,1452458,953172)