gaps-and-islands

I have a table with 2 columns of integers. The first column represents start index and the second column represents end index. START END 1 8 9 13 14 20 20 25 30 42 42 49 60 67 Simple So far. What I would like to do is group all the records that follow together: START END 1 25 30 49 60 67 A record can follow by Starting on the same index as the previous end index or by a margin of 1: START END 1 10 10 20 And START END 1 10 11 20 will both result in START END 1 20 I'm using SQL Server 2008 R2. Any help would be Great This works for your example, let me know if it doesn't work for other data

I have a simple table that is used to record events against specific visits: Describe Histories; +------------------+ | Field | +------------------+ | HistoryId | | VisitId | | Location | | Event | | EventTime | +------------------+ Individuals are associated with Visits (VisitId). For each Visit, an individual may have multiple History records. Events can be Admission, Transfer or Discharge. I am trying to write a Query to calculate the duration in each Location for each individual. Note, that they may visit a Location multiple times for each Visit. An individual enters a Location with an

I want, in a request, to fill all Null values by the last known value. When it's in a table and not in a request, it's easy: If I define and fill my table as follows: CREATE TABLE test_fill_null ( date INTEGER, value INTEGER ); INSERT INTO test_fill_null VALUES (1,2), (2, NULL), (3, 45), (4,NULL), (5, null); SELECT * FROM test_fill_null ; date | value ------+------- 1 | 2 2 | 3 | 45 4 | 5 | Then I just have to fill like that: UPDATE test_fill_null t1 SET value = ( SELECT t2.value FROM test_fill_null t2 WHERE t2.date <= t1.date AND value IS NOT NULL ORDER BY t2.date DESC LIMIT 1 ); SELECT *

Using SQL server 2000. If the Start date is 06/23/2008 and End date is 06/30/2008 Then I need the Output of query as 06/23/2008 06/24/2008 06/25/2008 . . . 06/30/2008 I Created a Table names as Integer which has 1 Column, column values are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 then I used the below mentioned query Tried Query SELECT DATEADD(d, H.i * 100 + T .i * 10 + U.i, '" & dtpfrom.Value & "') AS Dates FROM integers H CROSS JOIN integers T CROSS JOIN integers U order by dates The above query is displaying 999 Dates only. 999 Dates means (365 + 365 + 269) Dates Only. Suppose I want to select more

Consider some table T , ordered by Col1, Col2, Date1, Date2 : Col1 Col2 Date1 Date2 rate ABC 123 11/4/2014 11/5/2014 -90 ABC 123 11/4/2014 11/6/2014 -55 ABC 123 11/4/2014 11/7/2014 -90 ABC 123 11/4/2014 11/10/2014 -90 I want to group the data so that changes are easily audited/reduce repetition, so I have Col1 Col2 Date1 start_Date2 end_Date2 rate ABC 123 11/4/2014 11/5/2014 11/5/2014 -90 ABC 123 11/4/2014 11/6/2014 11/6/2014 -55 ABC 123 11/4/2014 11/7/2014 11/10/2014 -90 I can easily do that if I can get another column with the rows numbered as 1 2 3 3 (only important that numbers are