知与行哪个更难

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select * from tbl_Articles WHERE ArticleID=173733 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=173733 LIMIT 0,1
select * from tbl_Articles_sphinx where id=173733 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1088694,1129875,1715983,1946972,1130894,1759624,1072747,312311,166413,1493033,2141802,2185728,1754255,1993054,3385850,1085226,2172416,2170886,1842812,1576247,2109749,1123291,1085616,1823981,1095888,1619558,1066924,1099271,1110169,1682493) ORDER BY field (ArticleID,1088694,1129875,1715983,1946972,1130894,1759624,1072747,312311,166413,1493033,2141802,2185728,1754255,1993054,3385850,1085226,2172416,2170886,1842812,1576247,2109749,1123291,1085616,1823981,1095888,1619558,1066924,1099271,1110169,1682493)