SQL> create table ticket (id,assigned_to)
2 as
3 select 100, 'raju' from dual union all
4 select 101, 'raju' from dual union all
5 select 102, 'raju' from dual union all
6 select 103, 'anil' from dual union all
7 select 104, 'anil' from dual union all
8 select 105, 'sam' from dual union all
9 select 106, 'raju' from dual union all
10 select 107, 'raju' from dual union all
11 select 108, 'anil' from dual
12 /
Tabel is aangemaakt.
SQL> select min(id) from_id
2 , max(id) to_id
3 , assigned_to
4 from ( select id
5 , assigned_to
6 , id - row_number() over (partition by assigned_to order by id) grp
7 from ticket
8 )
9 group by assigned_to
10 , grp
11 order by from_id
12 /
FROM_ID TO_ID ASSIGNED_TO
---------- ---------- -----------
100 102 raju
103 104 anil
105 105 sam
106 107 raju
108 108 anil
5 rijen zijn geselecteerd.
**UPDATE mit den Ergebnissen eines Leistungsvergleichs mit der Lösung von tuinstoel:
Am 11.1.0.7:
SQL> exec runstats_pkg.rs_start
PL/SQL procedure successfully completed.
SQL> set termout off
SQL> select min(id) from_id
2 , max(id) to_id
3 , assigned_to
4 from ( select id
5 , assigned_to
6 , id - row_number() over (partition by assigned_to order by id) grp
7 from ticket
8 )
9 group by assigned_to
10 , grp
11 order by from_id
12 /
FROM_ID TO_ID ASSI
---------- ---------- ----
100 102 raju
103 104 anil
105 105 sam
106 107 raju
108 108 anil
109 111 raju
<snip>
589921 589922 raju
589923 589923 anil
327680 rows selected.
SQL> set termout on
SQL> exec runstats_pkg.rs_middle
PL/SQL procedure successfully completed.
SQL> set termout off
SQL> select * from table(testpl.pltest)
2 /
FROM_ID TO_ID ASSI
---------- ---------- ----
100 102 raju
103 104 anil
105 105 sam
106 107 raju
108 108 anil
109 111 raju
<snip>
589921 589922 raju
589923 589923 anil
327680 rows selected.
SQL> set termout on
Und die Ergebnisse:
SQL> exec runstats_pkg.rs_stop(100)
Run1 draaide in 547 hsecs
Run2 draaide in 549 hsecs
Run1 draaide in 99.64% van de tijd
Naam Run1 Run2 Verschil
STAT.recursive cpu usage 2 106 104
LATCH.row cache objects 91 217 126
STAT.bytes received via SQL*Net from client 37,496 37,256 -240
STAT.recursive calls 7 5,914 5,907
STAT.table scan rows gotten 615,235 589,824 -25,411
STAT.sorts (rows) 917,504 589,824 -327,680
Run1 latches totaal versus run2 -- verschil en percentage
Run1 Run2 Verschil Pct
10,255 10,471 216 97.94%
PL/SQL procedure successfully completed.
Viele Grüße, Rob.
