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C# 使用聚合函数查找数据库重复记录
C#利用聚合函数显示数据库中重复记录的数量,这个例子可找出数据库中的重复内容,对优化数据库很有帮助。实现本功能可参考以下代码:
dgv_Message.DataSource = GetMessage();//设置数据源
dgv_Message.Columns[0].Width = this.Width;//设置列宽度
dgv_Message.DataSource = GetStudent();//设置数据源
dgv_Message.Columns[0].Width = 200;//设置列宽度
string P_Str_SqlStr = string.Format(//创建SQL查询字符串
@"SELECT 所在学院 ,COUNT(所在学院) AS 学生数量 FROM tb_Student GROUP BY 所在学院");
SqlDataAdapter P_SqlDataAdapter = new SqlDataAdapter(//创建数据适配器
P_Str_SqlStr, P_Str_ConnectionStr);
DataTable P_dt = new DataTable();//创建数据表
P_SqlDataAdapter.Fill(P_dt);//填充数据表
return P_dt;//返回数据表,更多代码请下载本实例 。
- 2022-06-30 05:46:27下载
- 积分:1
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wavelet
小波变换,反变换,以及提升小波变换,包括97小波,及53小波(Wavelet transform, inverse transform, as well as the lifting wavelet transform, including the 97 wavelet, and 53 wavelet)
- 2021-01-06 11:58:55下载
- 积分:1
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edityuanma
一个具有丰富功能的对话框,含有两个编辑框和七个按钮,由一个按钮控制实现了编辑框之间的文本转移功能,并且可由按钮控制删除功能。(Rich functionality of a dialog box, and contains two edit boxes and the seven buttons, a button control from the realization of the edit box the text of the transfer function between, and may delete function button control.)
- 2008-05-27 04:39:45下载
- 积分:1
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backpropagation neural network implementation by c++ code
역 전파 C에 의해 신경 네트워크 구현 ++ 코드
- 2023-07-09 07:05:06下载
- 积分:1
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window set
窗口置顶器,VB.NET调用API设置指定窗体置顶于同类窗口-window set-top devices, called VB.NET designated Window API set in a similar set-top window
- 2023-06-27 15:35:03下载
- 积分:1
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myprojects
是用于开关磁阻电机的位置伺服控制的C语言源代码,基于CCS的开发环境.希望可以对你有所帮助.(For switched reluctance motor position servo control of the C language source code, based on CCS development environment. Hope you can help.)
- 2007-11-26 09:09:38下载
- 积分:1
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stm32-main
说明: STM32F107卡用于串口通讯代码,一个实用的例子(STM32F107 card is used for serial communication code, a practical example of)
- 2011-03-25 21:03:15下载
- 积分:1
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用C#实现BT体育发布区种子资源的自动下载功能
用C#实现BT体育发布区种子资源的自动下载功能-With C# Realize BT sports zone seed release resources automatically download function
- 2023-06-08 16:25:03下载
- 积分:1
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DAC8571模拟IIC
DAC8571通过iic协议和msp430通信(DAC8571 communicates with MSP430 through IIC protocol)
- 2020-06-21 11:40:02下载
- 积分:1
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Fault-analysis-of-power-system
本程序是电力系统故障分析中的短路计算,包含各种常见短路类型。压缩包中有word说明,包含程序的前期工作和电力系统序网图。(This program is a short circuit calculation power system fault analysis, including all common types of short circuit. Compressed package word description, preliminary work and electrical systems Sequence Network contains program.)
- 2014-06-30 11:36:47下载
- 积分:1