必须和必需的区别有什么

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select * from tbl_Articles WHERE ArticleID=2222048 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2222048 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2222048 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1105207,1108017,1609626,3469904,1911741,1400281,838481,1103202,1112981,779710,1701395,3298261,621963,1112222,1665464,1115763,1108211,1122651,1091631,2466279,1081937,1098653,1090068,1113497,1103720,1085232,1121988,652228,1117644,1105530) ORDER BY field (ArticleID,1105207,1108017,1609626,3469904,1911741,1400281,838481,1103202,1112981,779710,1701395,3298261,621963,1112222,1665464,1115763,1108211,1122651,1091631,2466279,1081937,1098653,1090068,1113497,1103720,1085232,1121988,652228,1117644,1105530)