为什么对约束进行分类

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select * from tbl_Articles WHERE ArticleID=682558 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=682558 LIMIT 0,1
select * from tbl_Articles_sphinx where id=682558 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(252296,1078380,1989872,1057080,1125385,1620263,1086770,1119103,2328810,2829830,314424,2791297,2984565,154117,1304908,1096493,1430915,1964033,987892,1568274,2218737,1308562,197207,1483993,116395,1083946,1086162,1102443,1607077,207178) ORDER BY field (ArticleID,252296,1078380,1989872,1057080,1125385,1620263,1086770,1119103,2328810,2829830,314424,2791297,2984565,154117,1304908,1096493,1430915,1964033,987892,1568274,2218737,1308562,197207,1483993,116395,1083946,1086162,1102443,1607077,207178)