Delete values for a range

Question

Hi ,
     I want to delete records only for a given range. Below is the script it deletes the records based on the given MP range.
And in this Switch table screen shot i have a switchID and ControlPointID column as main reference . For the given range only those records will be deleted. Now i want to delete a different table called SSDB_WIUDATA only for the controlpointIDs deleted on
this switch table. The scenario is ControlpointID will be same even out of the given range also.but switchID will be different So it was easy to delete the records in switch. But while deleting in WIU data i have  WIUDataID and ControlPointID as main
column reference . How do i delete the values from WIUData only for the values deleted in switch table? Here ControlPoint ID will be same even out of the range also. So i should delete only within the range that is deleted in Switch table. I dont have Milepost
refernce also in WIU table.i have only ControlPointID as reference. Pls help me 
IF (CURSOR_STATUS('global','Switch_cur')) >= -1 
BEGIN 
DEALLOCATE Switch_cur 
END
DECLARE Switch_cur CURSOR FOR
Select SwitchID,ControlPointID FROM SSDB_Switch
WHERE Milepost BETWEEN @BeginMP AND @EndMP 
AND SubdivisionID = @subdivisionID
OPEN Switch_cur
FETCH NEXT FROM Switch_cur INTO @SwitchID,@ControlPointID
WHILE (@@FETCH_STATUS=0)
BEGIN
   set @Swi = (select Talon_LocEqup_ID from Mapping
   where SSDB_ControlpointId_Asset_Id = @SwitchID and AssetType='PTC-Switch')
Delete from tbl_equipmentObjectPropertyValues 
where equipmentObjectPropertyValue_object_guid_fk = ''+@Swi+''
Delete from tbl_objects
where object_guid_pk = ''+@Swi+''
DELETE from Mapping
where SSDB_ControlpointId_Asset_Id = @SwitchID
 DELETE FROM SSDB_Clearancepoint
 WHERE SwitchID = @SwitchID
DELETE FROM  SSDB_TurnoutSpeed
WHERE SwitchID = @SwitchID
 DELETE FROM SSDB_SwitchRelationship
 WHERE SwitchID = @SwitchID
 DELETE FROM SSDB_Switch
 WHERE SwitchID = @SwitchID
  FETCH FROM Switch_cur INTO @SwitchID,@ControlPointID
     END ----Cur End
CLOSE Switch_cur
    DEALLOCATE Switch_cur        
Deepa

Answer 1

Below is the table structure of Switch and WIUData
CREATE TABLE SSDB_Switch (
SwitchID int IDENTITY PRIMARY KEY,
ControlPointID int,
WIUDataID int,
MilepostPrefix varchar(5),
MilepostSuffix varchar(5),
Milepost decimal(10,3) NOT NULL,
TrackName varchar(20) NOT NULL,
Latitude decimal(15,8) NOT NULL,
FOREIGN KEY(WIUDataID) REFERENCES               SSDB_WIUData(WIUDataID),
FOREIGN KEY(ControlPointID) REFERENCES          SSDB_ControlPoint(ControlPointID)
CREATE TABLE SSDB_WIUData (
WIUDataID int IDENTITY PRIMARY KEY,
ControlPointID int,
DeviceStatusTableID int NOT NULL,
BeaconFlag varchar(1) NOT NULL,
ConfigCRC varchar(8) NOT NULL,
EncryptedHmacKey varchar(64) NOT NULL,
WIUAddress varchar(64) NOT NULL,
WIUID decimal(12,0),
WIUName varchar(40),
WSRSType varchar(17),
InsertDate Datetime NOT NULL DEFAULT getdate(),
UpdateDate Datetime,
InsertUser varchar(50),
UpdateUser varchar(50),
FOREIGN KEY(ControlPointID) REFERENCES SSDB_ControlPoint(ControlPointID),
FOREIGN KEY(DeviceStatusTableID) REFERENCES SSDB_DeviceStatusConfiguration(DeviceStatusTableID),
FOREIGN KEY(BeaconFlag) REFERENCES SSDB_BeaconFlag(BeaconFlag),
FOREIGN KEY(WSRSType) REFERENCES SSDB_WSRSType(WSRSType)
Below is the screen shot for Switch for a range of 170 to 172 Milepost.For this range i have control point ID as 48. And even ControlPoint ID is same for 173 Milepost also. In switch i have deleted only for the range.
Below is the screenshot for WIU table . Here i have only ControlPointID as reference. Even in this table i should delete only the records deleted in switch table.
Deepa