Problem source: http://bbs.csdn.net/topics/391014229

Below is data from SL field of table

*tb1*:
SL

5

7

7

8

8

5

7

8

2

3

4

2

You need to calculate the sum of values every five rows. The
expected aggregate result is as follows:

1-5 35

6-10 25

11-12 6

That is, the first column is the interval of rows and the second one
is the sums of SL field values.

To do this in SQL, you need to use subqueries to generate sequence
numbers. Whereas esProc uses sorted sets to make the computation intuitive.
esProc code is as follows:

A1: Execute SQL to query SL data.

A2: Group and aggregate data according to member positions (sequence numbers). Result is as follows:

A3: Modify values in GN column that correspond to A2’ group numbers. Then you get the final computed result:

In a similar way any database is called, esProc can be called by the
reporting tool or a JAVA program. The computed result in the form of ResultSet
can be returned to JAVA main program via esProc JDBC. You can see related
documents for detailed method.