什么时候用t统计量

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select * from tbl_Articles WHERE ArticleID=992083 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=992083 LIMIT 0,1
select * from tbl_Articles_sphinx where id=992083 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1848662,604890,456980,80025,783427,2675207,477873,1215401,379287,815486,3245278,396897,728179,834624,854664,1791452,377945,737308,809559,573467,829642,744344,663744,829087,860311,715106,577667,529525,605078,3522745) ORDER BY field (ArticleID,1848662,604890,456980,80025,783427,2675207,477873,1215401,379287,815486,3245278,396897,728179,834624,854664,1791452,377945,737308,809559,573467,829642,744344,663744,829087,860311,715106,577667,529525,605078,3522745)