PK是什么意思

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select * from tbl_Articles WHERE ArticleID=2712382 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2712382 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2712382 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1117974,2202243,1494575,1678741,1323393,1078797,1069059,1080441,2552486,2718727,1701870,2797763,1075635,1098219,2519320,2642645,1096256,2381654,1066812,2294155,1052287,1057076,1697095,1068154,1071055,993095,2428570,2174684,1054792,1067487) ORDER BY field (ArticleID,1117974,2202243,1494575,1678741,1323393,1078797,1069059,1080441,2552486,2718727,1701870,2797763,1075635,1098219,2519320,2642645,1096256,2381654,1066812,2294155,1052287,1057076,1697095,1068154,1071055,993095,2428570,2174684,1054792,1067487)