datagirdview和listview,删改查sqlserver数据库的小结
//创建DBhelper数据库链接文件
private static string sqlcon = "server=.;database=myschool;uid=sa;pwd=sa";
public static SqlConnection connection = new SqlConnection(sqlcon);
============================================================
//首先是lv控件的列表显示 ,(listview)
// 清空当前lv表中内容
listview.Items.Clear();
string sql = "select * from question";
//引用DBhelper中的数据库链接
SqlCommand command = new SqlCommand(sql,DBhelper.connection);
//打开数据库,并用dr读取记录
DBhelper.connection.Open();
SqlDataReader dr = command.ExecuteReader();
while (dr.Read())
{
ListViewItem lvi = new ListViewItem(dr["Question"].ToString());
lvi.SubItems.AddRange(new string[] { dr["Answer"].ToString(), dr["Difficulty"].ToString(), dr["SubjectId"].ToString(), dr["OptionA"].ToString(), dr["OptionB"].ToString(), dr["OptionC"].ToString(), dr["OptionD"].ToString() });
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索引分为两大类:聚集索引和非聚集索引
一、聚集索引
当数据表中的一列被确定为主键后,SQLServer会自动为它建立聚集索引,因为聚集索引是标识每个记录行的键,所以它将被应用到每个查询中.
二、非聚集索引
非聚集索引的情况就比较复杂了,因为它是相对于表独立组织的,在SQLServer中有单独的结构来存储非聚集索引.
......
1.绝对值
S:select abs(-1) value
O:select abs(-1) value from dual
2.取整(大)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.取整（小）
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.� ......
In the latest installment of the SQL Server interview questions, we will outline questions suitable for a DBA interview to assess the candidates skills related to SQL Server system databases. In this tip, the questions are there to read, but the answers are intentionally hidden to really test your s ......
SQLServer和Oracle的常用函数对比
1.绝对值
S:select abs(-1) value
O:select abs(-1) value from dual
2.取整(大)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.取整（小）
S:select floor(-1.001) value
O:select floor(-1.001) value from dual ......
在sqlserver2005下使用下面语句
WITH t AS (
SELECT ROW_NUMBER() OVER(ORDER BY id DESC) as row_number, id,ss
&nb ......
