我需要一些帮助。我在SQL中查询的目标是使用两个单独查询的结果（结果A + B）计算特定车库中一个变量（汽车）的频率一段时间。
第一组结果（结果A）提供车库中的车辆列表及其各自的到达日期和退出日期（每条记录是一辆车，一个到达日期和一个退出日期）。第二组结果是使用@PeriodStartDate作为日期和@PeriodEndDate作为日期的CTE递归，提供结果（结果B）以及从开始日期到结束日期的所有日期。
从这里，我想要做的是从结果A中取出每一条记录，并将其与结果B的每条记录进行比较，有效地确定结果B的第一条记录/日期是否为1）＆gt; =到达日期，和2）＆lt;比退出日期。例如。如果2016-02-04到2016-03-15期间车辆在车库，并且期间开始和结束日期是2016-01-01到2016-03-01，我想拍这张车的记录，将其到达和退出日期与2016-01-01至2016-03-01的所有日期进行比较，然后对结果A中的每辆车/记录重复该过程。
完成此练习后，我希望查询产生2016-01-01至2016-03-01每个日期车库中存在的车辆数量。
到目前为止，对A和B结果的查询已经完成，但老实说我不知道如何开始下一部分。
谢谢你， MIKEY
答案 0 :(得分：0)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
//Server paths.
private static string masterserverPath = @"\\IPAddress\e$\BatchImport\";
private static string personalPath = masterserverPath + "HR PersonalFile\\";
private static string benefitsPath = masterserverPath + "HR Benefits\\";
private static string workCompPath = masterserverPath + "HR WC\\";
private static string LOAPath = masterserverPath + "HR LOA\\";
//values to dynamicaly populate 4 division in subdiv dropdown list
string[] personalSubDivArr = {"Employment Inquiry", "EBI", "W-4", "Driver's Application", "Direct Deposit",
"Address Changes", "Name Changes", "Employment Verifications", "New Hire-Rehire Datasheet",
"PAF's Status Changes", "Acknoledgement of Wages for NY and CA", "Counseling",
"Record of Conversation", "Written Warning-Attachments", "Probationary Counseling-Attachments",
"Final Warning", "Final Incident Documentation", "Commendations", "Goals and Objectives",
"performance Reviews", "Associate Acknowledgements", "Associate Develepment Programs",
"Unemployment", "EEOC forms", "I-9"};
string[] benefitsSubDivArr = {"Associate Benefits Enrollments", "Dependant Eligibility Verifications", "HIPPA Forms","Physicians Documents",
"Repayment Agreements", "Beneficiary forms", "Medical Claims", "Acknowledgement Forms", "Cancellation Forms"};
string[] WCSubDivArr = {"First Report of Injury", "Workers Comp. Medical Claims", "Adjuster Notes", "Wage Statements Verifications",
"State Forms", "Medical Improvement Reports", "Release", "Miscellaneous"};
string[] LOASubDivArr = {"Request for LOA", "Initial Letter", "Medical Certification", "Approval Letter", "Medical Updates", "Extensions",
"Release", "Return Letter", "Notes"};
string newFileName;
protected void Page_Load(object sender, EventArgs e)
{
}
//Button1 fires up validations before uploading the file to the server
protected void Button1_Click(object sender, EventArgs e)
{
//verify if a file to upload exists
if (FileUpload.HasFile)
{
string fileExtension = System.IO.Path.GetExtension(FileUpload.FileName).ToLower();
string[] allowedExtensions = {".pdf"};
for (int i = 0; i < allowedExtensions.Length; i++)
{
//make sure document is of appropiate type **pdf in this case
if (fileExtension == allowedExtensions[i])
{
//make sure none of the fields are empty
if (string.IsNullOrWhiteSpace(LnameTextBox.Text) || string.IsNullOrWhiteSpace(FnameTextBox.Text)
|| string.IsNullOrWhiteSpace(SSNTextBox.Text) || string.IsNullOrWhiteSpace(FileNoTextBox.Text)
|| SubDivDropDownList.Text == "Select an option" || MasterDropDownList.Text == "Select an option")
{
UploadMssgLabel.Text = "Employee and Document info cannot be empty.";
}
else
{
//string to rename file
newFileName = (FnameTextBox.Text + " " + LnameTextBox.Text + " " + SubDivDropDownList.Text
+ " " + "FileNo-" +FileNoTextBox.Text + fileExtension);
Response.Write("<script>alert('Inside save');</script>");
try
{
//select which path to save the file to
string destinationPath;
switch (MasterDropDownList.Text)
{
case "Personal":
destinationPath = personalPath;
break;
case "Benefits":
destinationPath = benefitsPath;
break;
case "WorkersComp":
destinationPath = workCompPath;
break;
case "LOA":
destinationPath = LOAPath;
break;
default:
destinationPath = null;
break;
}
Response.Write("<script>alert('Saving "+ newFileName +"');</script>");
FileUpload.PostedFile.SaveAs(Server.MapPath(destinationPath) + newFileName); //I have tried with Server.MapPath() an without it
UploadMssgLabel.ForeColor = System.Drawing.Color.Green;
UploadMssgLabel.Text = "Upload Successful!";
}
catch (Exception ex)
{
Response.Write("<script>alert('" + ex.Message + "');</script>");
}
Response.Write("<script>alert('ending save');</script>");
}
}
else
{
UploadMssgLabel.Text = "Cannot accept files of this kind.";
}
}
}
else
{
UploadMssgLabel.Text = "Please select a file.";
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
//Clear the subdiv dropdown every selection. Otherwise, items would just keep being added on
SubDivDropDownList.Items.Clear();
//switch to dynamicaly populate the subdiv dropdown
switch (MasterDropDownList.SelectedValue)
{
case "Personal":
populateDropDown(SubDivDropDownList, personalSubDivArr);
break;
case "Benefits":
populateDropDown(SubDivDropDownList, benefitsSubDivArr);
break;
case "WorkersComp":
populateDropDown(SubDivDropDownList, WCSubDivArr);
break;
case "LOA":
populateDropDown(SubDivDropDownList, LOASubDivArr);
break;
default:
SubDivDropDownList.Items.Add("Select an option");
break;
}
}
//Method to populate a dropdown with an array
private void populateDropDown(DropDownList list, Array arr)
{
list.Items.Add("Select an option");
foreach (string s in arr)
{
list.Items.Add(s);
}
}
}
这将返回在期间结束之前到达并在期间开始后退出的汽车总数
你可以改变
Select Count(*) AS TotalCars, B.PeriodStart, B.PeriodEnd
FROM A
JOIN B
ON A.Arrival <= B.PeriodEnd
AND A.Exit > B.PeriodStart
Group By B.PeriodStart, B.PeriodEnd
到
AND A.Exit > PeriodStart
捕捉最后一段时间尚未退出的汽车