如何从另一个表中显示列的值

Question

如何在网络表格表格中显示Department到tblDepartment列tblEmployee列的值？我有这段代码，但它只显示DeptID。

这是Page_load代码

        sConn = new SqlConnection(sStr);
        daEmp = new SqlDataAdapter("SELECT * FROM tblEmployee", sConn);
        daDep = new SqlDataAdapter("SELECT * FROM tblDepartment", sConn);
        dsEmp = new DataSet();
        dsDep = new DataSet();

        daEmp.Fill(dsEmp, "tblEmployee");
        daDep.Fill(dsDep, "tblDepartment");

        dsEmp.Tables["tblEmployee"].PrimaryKey = new DataColumn[] { dsEmp.Tables["tblEmployee"].Columns["EmployeeID"] };

        DataTable dt = new DataTable();

        dgvEmployee.DataSource = dsEmp.Tables["tblEmployee"];
        dgvEmployee.DataBind();

这些是表格

Answer 1

当您需要显示来自两个或多个不同tables的信息时，您可以join根据关系（primary key和foreign key）列显示这些信息：

您需要替换此查询：

SELECT * FROM tblEmployee

有了这个：

SELECT employee.*,department.Department 
FROM tblEmployee employee 
    INNER JOIN tblDepartment department ON employee.DeptID=department.DeptID