如何获得带小数位数的mysql结果到2

Question

我有以下查询..

SELECT p.product_id,p.description,sum(sl.qty*sl.factor) as qty
FROM sale_line as sl
LEFT JOIN sale as s ON(sl.sale_id=s.sale_id)
LEFT JOIN product as p ON(p.product_id=sl.product_id)
ORDER BY sl.product_id DESC;

我想得到＆＃34;总和（sl.qty * sl.factor）为数量＆＃34;字段舍入到小数点后两位。 例如。如果结果得到了13.170000484884＆＃39;，我想进入＆＃39; 13.17＆＃39;结果。

Answer 1

使用ROUND()功能：

ROUND(sum(sl.qty*sl.factor),2) as qty

查询：

SELECT p.product_id,p.description,ROUND(sum(sl.qty*sl.factor),2) as qty
FROM sale_line as sl
LEFT JOIN sale as s ON(sl.sale_id=s.sale_id)
LEFT JOIN product as p ON(p.product_id=sl.product_id)
ORDER BY sl.product_id DESC;