什么是对角线

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select * from tbl_Articles WHERE ArticleID=1167447 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1167447 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1167447 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1662951,1089766,1113746,2373985,2600486,1063230,1096675,830330,363143,1104675,704059,753939,877830,1038466,2611028,1089328,2549420,1112832,1122603,1561906,1102252,2723122,583084,2800020,387602,2398600,604942,1125726,1070629,1390333) ORDER BY field (ArticleID,1662951,1089766,1113746,2373985,2600486,1063230,1096675,830330,363143,1104675,704059,753939,877830,1038466,2611028,1089328,2549420,1112832,1122603,1561906,1102252,2723122,583084,2800020,387602,2398600,604942,1125726,1070629,1390333)