pk和vs有什么区别

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select * from tbl_Articles WHERE ArticleID=1123424 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1123424 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1123424 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1119892,1115365,1132541,1107939,1115743,1071253,1101595,1087922,1275635,1110448,1118016,1108047,1118953,1109823,1127094,1117482,1126444,1115897,1370723,1083094,1108283,1109026,1114356,1103753,1104011,1115369,1080531,1120229,1122058,1084389) ORDER BY field (ArticleID,1119892,1115365,1132541,1107939,1115743,1071253,1101595,1087922,1275635,1110448,1118016,1108047,1118953,1109823,1127094,1117482,1126444,1115897,1370723,1083094,1108283,1109026,1114356,1103753,1104011,1115369,1080531,1120229,1122058,1084389)