坐标系统分为哪三种

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select * from tbl_Articles WHERE ArticleID=2473877 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2473877 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2473877 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2538837,1129879,1126128,2688578,2960655,1086756,2733438,2163659,354322,338034,1128765,1677397,1707421,1109887,2337178,3242724,277007,2687007,2150364,639751,1060657,2492748,2553074,2056424,175950,375906,1993189,1278441,3344932,2950252) ORDER BY field (ArticleID,2538837,1129879,1126128,2688578,2960655,1086756,2733438,2163659,354322,338034,1128765,1677397,1707421,1109887,2337178,3242724,277007,2687007,2150364,639751,1060657,2492748,2553074,2056424,175950,375906,1993189,1278441,3344932,2950252)