Spilting a record into multiple record

Question

Hi experts, need your help for your to frame a query for the below requirement
Scenario 1
For a same store fetch the record with least priority (35) and check if the Servicearea begin date & Servicearea end date of that store is minimum for that group.
If minimum then select that record alone as shown below
Item DC Store Serviceare Bgn Date Service Area End date Priority
9856698 1469 2952 3/5/2011 12/31/9999 100
9856698 3107 2952 12/10/2011 8/3/2012 35
Item DC Store St Date End date Priority
9856698 3107 2952 12/10/2011 8/3/2012 35
Scenario 2
For a same store fetch the record with least priority (35) and check if the Servicearea begin date & Servicearea end date of that store is minimum for that group.
If not minimum split the records for that group as shown below and select the record which has the lowest priority(35) and with minimum startdate and end date range.
Item DC Store Serviceare Bgn Date Service Area End date Priority
9856698 1469 2952 3/5/2011 12/31/9999 35
9856698 3107 2952 12/10/2011 8/3/2012 100
Item DC Store St Date End date Priority
9856698 1469 2952 3/5/2011 12/9/2011 35
9856698 3107 2952 12/10/2011 8/3/2012 100
9856698 1469 2952 8/4/2012 12/31/9999 35

Answer 1

Here comes the scenarios.....
Scenario 1                              
Query should check for priority record(25), if the start_date and end_date of that priority record is the max i that group, records will not have any split.
output will be the same.
DC     Store     St Date     End date     Priority          
955     3     1/1/2010     12/31/9999     25          
966     3     4/5/2011     10/10/2011     50          
977     3     10/12/2011 12/12/2012     100          
output                         Priority     
955     3     1/1/2010     12/31/9999     25     1     
966     3     4/5/2011     10/10/2011     50     2     
977     3     10/12/2011 12/12/2012     100     3     
Scenario 2
If priority record is not covering the max range, then split the records as shown below,
1. during the time period 1/1/2011 & 4/30/2011 there were no other DC for that store so rank would be 1
2. the next range would be 5/1/2011 to 6/29/2011 we have 2 records in service so the record with low priortiy would be ranked 1 and second priority would be ranked 2
3. similarly, for 6/30/2011 to 10/1/2011 we have 3 records in service and it will be ranked accordingly on the priority.
DC     Store     St Date     End date     Priority          
966     3     6/30/2011     10/1/2011     25          
955     3     5/1/2011     11/30/2011     50          
977     3     1/1/2011     12/31/2011     100          
output                         Priority     
977     3     1/1/2011     4/30/2011     100     1     
955     3     5/1/2011     6/29/2011     50     1     
977     3     5/1/2011     6/29/2011     100     2     
966     3     6/30/2011     10/1/2011     25     1     
955     3     6/30/2011     10/1/2011     50     2     
977     3     6/30/2011     10/1/2011     100     3     
955     3     10/2/2011     11/30/2011     50     1     
977     3     10/2/2011     11/30/2011     100     2     
977     3     12/1/2011     12/31/2011     100     1     
Scenario 3     
This works similar to scenario 2
DC     Store     St Date     End date     Priority          
966     3     2/1/2011     12/31/2011     25
955     3     1/1/2011     12/31/2012     50          
977     3     5/1/2011     06/31/2011     100          
output                         Priority     
955     3     1/1/2011     1/31/2011     50     1     
966     3     2/1/2011     12/31/2011     25     1     
955     3     2/1/2011     12/31/2011     50     2     
977     3     5/1/2011     6/30/2011     100     3     
955     3     1/1/2012     12/31/2012     50     1