sql查询连接多个表

问题描述

我创建了一个存储过程，在这里我想从多个表中检索信息.我创建了它，如果显示给我看，它可以工作.但是，当我运行它以获取表中的数据时，它返回空

I have created a stored procedure where i want to retrieve information out of multiple tables. i have created it and if shows me that ot works. But when i run it to get the data in the tables it returns empty

推荐答案

ALTER PROCEDURE [dbo].[procGetSingleAppointmentDate]

@Date nvarchar(20)
AS

        SELECT AppointmentType.AppointmentType,AppointmentSlots.AvailabilityTimes,Patient.PatName
    FROM AppointmentType,AppointmentSlots,Patient,Employee
    WHERE AppointmentType.TypeID=AppointmentSlots.TypeID AND AppointmentSlots.PatientID=Patient.PatientID AND Employee.EmpRecNumber = AppointmentSlots.EmpRecNumber
        AND AppointmentSlots.Date = @Date;

ALTER PROCEDURE [dbo].[procGetSingleAppointmentDate]

\\the code to send date
<pre lang="cs">protected void btnSearch_Click1(object sender, EventArgs e)
    {
          bl = new BusinessLayer();
        DataTable appointment = new DataTable();
        appointment = bl.GetSpecificAppointment       (DatePicker.SelectedDate.ToShortDateString());

        gdvSingleAppointment.DataSource = appointment;
        gdvSingleAppointment.DataBind();
    }

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