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  • gridiew列求和,表的列求和,表的记录数,时间段查询

    下面求的是gridview中第5列的值,并在lable1中显示
    protected void Page_Load(object sender, EventArgs e)
        {
            int b=0;
            DataSet1TableAdapters.fri dtdf = new DataSet1TableAdapters.friTableAdapter();
            DataSet1.friDataTable dtbl = new DataSet1.friDataTable();
            dtdf.Fill(dtbl);
            GridView1.DataSource=dtbl;
            GridView1.DataBind();
            for (int i = 0; i < GridView1.Rows.Count; i++)
            {
                int a=Convert.ToInt32( GridView1.Rows[i].Cells[4].Text);
                b = b + a;
            }
            Label1.Text = Convert.ToString(b);

        }

    或者直接用sql语句写:select sum (lie) from biao

    表的外连接查询
    select a.userId,a.det,b.title,summary from biao_1 a inner join biao_2 b on a.id=b.id
    当所查字段两个表中都有时,需要表明属于哪个表,如det字段在biao_1和biao_2中都有,则写a.det

    查询表的行数select count(*) from biao

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  • 原文地址:https://www.cnblogs.com/yubufan/p/3287601.html
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