Get range in one record from individual records

Question

Hi,
I want to get range (eg: No. 1-5) in record from 5 separate records.
Eg:
Data
ID Group#
123 1
123 2
123 3
123 4
123 5
123 9
Expected result
ID Group
123 1-5
123 9
Thanks
AT

Answer 1

Hi,
That is:
WITH     lagged     AS
     SELECT     id, group#
     ,     LAG (group#, 1, group#) OVER
               ( PARTITION BY     id
                 ORDER BY     group#
               )     AS prev_group#
     FROM     table_x
,     regimed     AS
     SELECT     id, group#
     ,     COUNT     ( CASE
                    WHEN  group#     > prev_group# + 1
                    THEN  1
                 END
               ) OVER     ( PARTITION BY     id
                      ORDER BY     group#
                    )     AS regime_num
     FROM     lagged
SELECT     id
,     TO_CHAR (MIN (group#))
     || CASE
          WHEN  MAX (group#) > MIN (group#)
          THEN  '-' || TO_CHAR (MAX (group#))
        END     AS group#_range
FROM     regimed
GROUP BY     id, regime_num
ORDER BY     id, regime_num;I assume your real data has multiple values for id, which need to be kept separate.
This sample data:
INSERT INTO table_x (id, group#) VALUES (123,     1);
INSERT INTO table_x (id, group#) VALUES (123,     2);
INSERT INTO table_x (id, group#) VALUES (123,     3);
INSERT INTO table_x (id, group#) VALUES (123,     4);
INSERT INTO table_x (id, group#) VALUES (123,     5);
INSERT INTO table_x (id, group#) VALUES (123,     9);
INSERT INTO table_x (id, group#) VALUES (987,     1);
INSERT INTO table_x (id, group#) VALUES (987,     1);
INSERT INTO table_x (id, group#) VALUES (987,     2.5);
INSERT INTO table_x (id, group#) VALUES (987,     3.4);
INSERT INTO table_x (id, group#) VALUES (987,     4.3);produces these results:
.       ID GROUP#_RANGE
       123 1-5
       123 9
       987 1
       987 2.5-4.3