Get first and last of serial group in oracle - sql

Question

I'm trying to select from table (sorted):
+--------+-------+
| Serial | Group |
+--------+-------+
| 0100 | 99 |
| 0101 | 99 |
| 0102 | 99 |
| 096 | 92 |
| 097 | 92 |
| 099 | 93 |
| 23 | 16 |
| 95 | 87 |
| 99 | 90 |
| 100 | 90 |
| 101 | 90 |
| 102 | 90 |
| a | a |
| b | b |
| c | c |
+--------+-------+
and I would like table (first, last and quantity by group):fsdfsdfsdfdsfsdf
+------------+----------+----------+
| fromSerial | toSerial | quantity |
+------------+----------+----------+
| 0100 | 0102 | 3 |
| 096 | 097 | 2 |
| 099 | 099 | 1 |
| 99 | 102 | 4 |
| 23 | 23 | 1 |
| 95 | 95 | 1 |
| a | a | 1 |
| b | b | 1 |
| c | c | 1 |
+------------+----------+----------+
My query
Thanks.

Answer 1

you can use window analytic function row_number to partition the data based on the group column
you can also get number of elements in each partition
you can then do case based aggregation to get the from and to serial number values.
SQL Fiddle Demo
with cte
as
(
select "Serial", "Group", row_number() over ( partition by "Group" order by "Serial" ) as rn,
count(*) over ( partition by "Group") as cnt
from Table1
)
select max(case when rn =1 then "Serial" end) as "FromSerial",
max(case when rn =cnt then "Serial" end) as "ToSerial",
max(cnt) as quantity
from cte
group by "Group"

Answer 2

Use MIN, MAX and GROUP BY.
And, DO NOT use keyword GROUP as column name.
SQL> WITH DATA AS(
2 SELECT '0100' Serial, '99' "GROUP_1" FROM dual UNION ALL
3 SELECT '0101' , '99' FROM dual UNION ALL
4 SELECT '0102' , '99' FROM dual UNION ALL
5 SELECT '096' , '92' FROM dual UNION ALL
6 SELECT '097' , '92' FROM dual UNION ALL
7 SELECT '099', '93' FROM dual UNION ALL
8 SELECT '23' , '16' FROM dual UNION ALL
9 SELECT '95' , '87' FROM dual UNION ALL
10 SELECT '99' , '90' FROM dual UNION ALL
11 SELECT '100' , '90' FROM dual UNION ALL
12 SELECT '101' , '90' FROM dual UNION ALL
13 SELECT '102' , '90' FROM dual UNION ALL
14 SELECT 'A' , 'A' FROM dual UNION ALL
15 SELECT 'b' , 'b' FROM dual UNION ALL
16 SELECT 'c' , 'c' FROM dual
17 )
18 SELECT MIN(serial) fromserial,
19 MAX(Serial) toserial,
20 COUNT(*) quantity
21 FROM DATA
22 GROUP BY group_1
23 ORDER BY fromserial
24 /
FROM TOSE QUANTITY
---- ---- ----------
0100 0102 3
096 097 2
099 099 1
100 99 4
23 23 1
95 95 1
A A 1
b b 1
c c 1
9 rows selected.
SQL>

Answer 3

Try this query :
SELECT grp,
Cast(Min(Cast(serial AS INT)) AS VARCHAR2(30)) fromserial,
Cast(Max(Cast(serial AS INT)) AS VARCHAR2(30)) toserial,
Count(*) quantity
FROM yourtable
WHERE NVL(LENGTH(TRIM(TRANSLATE(serial, '0123456789', ' '))), 0) = 0
GROUP BY grp
UNION
SELECT grp,
Cast(Min(serial) AS VARCHAR2(30)) fromserial,
Cast(Max(serial) AS VARCHAR2(30)) toserial,
Count(*) quantity
FROM yourtable
WHERE NVL(LENGTH(TRIM(TRANSLATE(serial, '0123456789', ' '))), 0) != 0
GROUP BY grp
ORDER BY grp
Sqlfiddle