小编san*_*een的帖子

我在SQL中有Query

SELECT        COUNT(DISTINCT dbo.Polling_Stations.P_ID) AS [Male Stations]
FROM            dbo.Agent INNER JOIN
                     dbo.Polling_Stations ON dbo.Agent.P_ID = dbo.Polling_Stations.P_ID
GROUP BY dbo.Polling_Stations.Gender
HAVING        (dbo.Polling_Stations.Gender = N'Male')

我已将其转换为Access为:

SELECT        COUNT(DISTINCT Polling_Stations.P_ID) AS [Male Stations]
FROM            Agent INNER JOIN
                     Polling_Stations ON Agent.P_ID = Polling_Stations.P_ID
GROUP BY Polling_Stations.Gender
HAVING        (Polling_Stations.Gender = 'Male') 

但它给了我一个错误:查询表达式'Count(DISTINCT Polling_Stations.P_ID)'中的语法错误(缺少运算符).

我有LQ EPSON 300打印机

我想以打印机的默认字体打印一些数据

我认为如果我们使用c#代码打印该打印机的默认字体就可以了.

PrintDocument pd = new PrintDocument();
pd.DefaultPageSettings.PaperSize = new PaperSize("A4", 950, 555);
pd.PrintPage += new PrintPageEventHandler(this.FontAndLocation);
pd.Print();

private void FontAndLocation(object sender, PrintPageEventArgs e)
{
   e.Graphics.DrawString(textBox1.Text.ToString(), new Font("Bookman Old Style", 18, FontStyle.Bold), Brushes.Black, 20, 95);
   e.Graphics.DrawString(textBox2.Text.ToString(), new Font("Bookman Old Style", 18, FontStyle.Bold), Brushes.Black, 20, 165);
   e.Graphics.DrawString(textBox3.Text.ToString(), new Font("Courier New", 18, FontStyle.Bold), Brushes.Black, 20, 265);
}       

我尝试通过互联网搜索,但我失败了,我无法解决我的问题我写的代码不打印在草稿/点阵(打印机的默认)字体.我们可以用代码或任何能够以EPSON-LQ 300默认字体打印的代码调用打印机吗？

这是在3中找到最大值的代码,但我想找到最大值的代码5:

Dim a, b, c As Integer

a = InputBox("enter 1st no.") 
b = InputBox("enter 2nd no.") 
c = InputBox("enter 3rd no.")

If a > b Then 
    If a > c Then 
        MsgBox("A is Greater") 
    Else 
        MsgBox("C is greater") 
    End If 
Else 
    If b > c Then 
        MsgBox("B is Greater") 
    Else 
        MsgBox("C is Greater")
    End If 
End If 

计算以下算法的复杂性？

我有以下代码片段:

i = 1;
while (i < n + 1) {
    j = 1;
    while (j < n + 1) {
        j = j * 2;
    }
    i = i + 1;
} 

请详细解释一下

我想知道解决问题的步骤,以便我可以解决这些问题