MySQL 奇怪的四舍五入结果

Question

我在 MySQL 中发现了一些舍入错误。这是我的查询:

SELECT /*debugz*/ ROUND((SUM(grade)/2),0) AS grade, SUM(grade) FROM entry.computed_grade a WHERE a.stud_id='7901159' AND a.sy='2014' AND a.term=01 AND a.terms=01 AND a.catalog_no='Christian Life Formation';

结果是这样的:

grade  sum(grade)  
------  ------------
    92           185

成绩结果应该是 93，而不是 92，因为 185/2 = 92.5

Answer 1

试试这个

SELECT CEIL((SUM(grade)/2),0) AS 成绩，SUM(grade) FROM entry.compulated_grade a WHERE ((a.stud_id='7901159') AND (a .sy='2014') AND (a.term=01) AND (a.terms=01) AND (a.catalog_no='基督教生命形成'));