how to set bit true in sql

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i have web form and data is inserted properly.against one employee i have multiple records in the table.

C#

EmployeeStatus empStatus = new EmployeeStatus();
              empStatus.Employee_Id = Employee.Id;
              empStatus.EmployeeStatusType_Id = SafeConvert.ToByte(ddlEmpStatus.SelectedValue);
              empStatus.StartDate = SafeConvert.ToDateTime(txtStartDate.Text);
              empStatus.EndDate = SafeConvert.ToDateTime(txtEndDate.Text);
              empStatus.Sector_Id = SafeConvert.ToByte(ddlSelectSector.SelectedValue);
              empStatus.Rank_Id = SafeConvert.ToByte(ddlRank.SelectedValue);
              empStatus.IsDutiable = txtIsDutiable.Checked;
              empStatus.HasWirles = txtHasWirles.Checked;
              empStatus.DutyType_Id = SafeConvert.ToByte(ddlDutyType.SelectedValue);
              empStatus.EmployeeShift_Id = SafeConvert.ToByte(ddlEmployeeShift.SelectedValue);
              _service.InsertEmployeeStatus(empStatus);
              _queryStatus = empStatus.Id > 0;

i have tried all last&default method,orderby,etc but result is getting properly.because against one employee there are different status and different duty type, so i got one idea that i add a new column in that table which is a bit type,and when i insert new record against that employee bit is set true for that last record and for previous records is set false>>how that cab be done using c#.

Posted 23-Jan-15 8:14am

Sajid227

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2 solutions

Solution 1

You still need primary key, let it be Status_Id. If it is an autoincrement field, you can select the record with the highest Status_Id for that specific Employee_Id, you get the latest.

[update]
Here is described how you can get highest ranked by group of rows. In this case, the raking is the Status_Id, and the grouping criteria is Employee_Id, filtered by Status: https://smehrozalam.wordpress.com/2009/12/29/linq-how-to-get-the-latest-last-record-with-a-group-by-clause/[^]

Posted 23-Jan-15 8:20am

Zoltán Zörgő

Updated 23-Jan-15 9:00am

v3

Comments

Sajid227 23-Jan-15 14:37pm

but problem is that i have to get all the employee having same status,so i want to get last record against each employee of same status

Zoltán Zörgő 23-Jan-15 14:59pm

See update

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Wendelius · Accepted Answer · 2015-01-23T08:36:00

If I understood your question correctly, in my opinion that would be a bad design.

Instead you should have employee table having the attributes that are not "time specific". Columns like Id, name and so on.

Then you should have a child table which should contain the Type, Status and whatever may be changed over time. This table should have at least one column defining the moment when the status on the row became valid. This way you only add new rows to the table and these new rows logically invalidate older rows for the specified employee.

Something like

EmployeeStatus
--------------
- EmployeeId int
- Type       int
- Status     int
- ValidFrom  datetime