SQL - 如何四舍五入到小数点后两位

Question

我有一个查询如下

Dim DoneAvgCont As New OleDbCommand("select avg(diffpay) ,conrtname from metersdone",con)
Dim DoneAvgContdb As New OleDbDataAdapter(DoneAvgCont)
    Dim DoneAvgContDt As New DataTable

avg(diffpay) 列的结果就像 55.2516494664，我想四舍五入到 55.25

我使用visual basic.net 2015，我从访问中获取

Answer 1

像这样在第一行编辑您的查询

Dim DoneAvgCont As New OleDbCommand("select round(avg(diffpay),2) ,conrtname from metersdone",con)