over-clause

I want to Aggregate a column over timestamps. Here an example: Table contains columns like col1, col2, ..., col_ts (timestamp column). SELECT SUM(col1) OVER (ORDER BY col_ts ROWS BETWEEN 2 PRECEDING AND 2 FOLLOWING) SUM1, SUM(col2) OVER (ORDER BY col_ts ROWS BETWEEN 2 PRECEDING AND 2 FOLLOWING) SUM2 FROM ... Now i want only the 2 PRECEDING and the 2 FOLLOWING ROWS SUMMED when the difference between the timestamps are <= 5 minutes. For example, lets look at these timestamp values: 14.09.15 15:44:00 14.09.15 15:50:00 14.09.15 15:51:00 14.09.15 15:52:00 14.09.15 15:53:00 When were are at the row

I am receving execution error in following sql script. Select TOP 1 Percent a.accode,a.voucherdate,a.credit,a.Debit, SUM(a.Debit) Over (Order By [a.accode],[a.voucherdate] ) as rdr from VoucherMain as a Order By a.accode,a.voucherdate Error Message Incorrect syntax near 'order'. Can anyone tell me what's wrong with the script syntext? The problem is that you need SQL Server 2012 and above. Okay, I added the "and above" for future visitors, but compare 2008 OVER CLAUSE with 2012 OVER CLAUSE . The 2008 version has this important note: When used in the context of a ranking window function, <ORDER