512代表什么意思

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select * from tbl_Articles WHERE ArticleID=3243706 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3243706 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3243706 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1092745,751048,1134397,907114,672361,721717,1056658,1189741,595906,1121709,1048680,595338,1133045,1021001,489783,476097,686051,393051,454410,482976,500366,655547,623319,419669,361007,1079438,670353,1870944,1077228,986673) ORDER BY field (ArticleID,1092745,751048,1134397,907114,672361,721717,1056658,1189741,595906,1121709,1048680,595338,1133045,1021001,489783,476097,686051,393051,454410,482976,500366,655547,623319,419669,361007,1079438,670353,1870944,1077228,986673)