只显示选择 SQL 中的前 5 个字符？

Question

I would like to know if it is possible to show only the 5 first characters.

I've tried using LEFT but couldn't. What I want is that when performing the query only the first 5 characters appear.
EX:
How is it done today:

380.902349

How I wanted it to be:

380.90

Can you help me.

Answer 1

Cast after the mathematical calculation. And, use the size of the decimal you want. Something like this:

CAST(AVG(md-duration * 1.0) / 1000 as DECIMAL(10, 2))

Answer 2

您可以使用 MySQL FORMAT函数，它带有 2 个参数，第一个值和第二个您想要小数点后的位数。