Question

我有以下SQL查询：

select u.user_name, sum(r.goals) total_goals, sum(r.goals)/(2 * count(1)) avg_goals 
from (select community_id, player1_id id, player1_goals goals 
from results union all select community_id, player2_id, player2_goals from results) r 
inner join users u on r.id = u.id 
where r.community_id = 16 group by r.id, u.user_name 
ORDER BY avg_goals DESC

产生如下结果 "avg_goals" , "1.2500"（我只对此实例的此列感兴趣）

如何将结果中的小数位数限制为2？因此输出将是1.25而不是1.2500

Answer 1

您可以使用ROUND(col, 2)

cd /path/to/glib/source/bld
make clean
../configure --prefix=/mingw
make
make install

正如@scaisEdge所说，如果你只想截断其余的数字，你也可以使用truncate（col，2）。

Answer 2

你应该使用TRUNCATE，例如：

   SELECT TRUNCATE(1.2500,2) from dual ;


   SELECT TRUNCATE(round(sum(r.goals)/(2 * count(1)),2), 2) .....

如何在此sql查询中将小数位数限制为2？

2 个答案: