2020-02-16 标签:javascript,关于,select,相关,操作,说明,插入,option,dom,方法,var,oselectyear,document,selectyear,op,innerhtml,2010

一、 插入option 1、DOM方法 var oSelectYear = document.getElementById("SelectYear"); var op = document.createElement("option"); op.innerHTML = "2010"; op.valu

2020-02-16 标签:sqlserver,2005,t,sql,query,学习,笔记,select,字句,逻辑,语句,进行,处理,一步,以下,查询,会发,错误

Select字句在逻辑上是SQL语句最后进行处理的最后一步，所以，以下查询会发生错误：SELECTYEAR(OrderDate) AS OrderYear,COUNT(DISTINCT CustomerID) AS NumCustsFROM dbo.OrdersGROUP BY OrderYear;