Using Partitions in OS X ~ Remove Partitions without Formatting!!
Hello,
I have 3 partitions on my iMac G5. I have my Primary OS (10.4.8), and Panther (10.3.9), and a partiton for storing files.
I want to delete the two partitons, and just make the primary partition larger. I tried in Disk Mananger, but it says you cannot modify your startup volume.
I have my startup disks, and can I resize, and delete partitions with those disks? I have to much information to backup, so I just want to delete the other two partitions, so I have one large partition.
Thanks for the help.
Kayle
iMac G5, 2.1GHz, iSight, 1.5GB Ram Mac OS X (10.4.8)
You cannot re-partition a hard drive using Disk Utility without losing all the data on the drive. There are several third-party products that claim to be able to re-partition on the fly without data loss, e.g., iPartition, Disk Studio, VolumeWorks, and Drive Genius. You can find these at www.versiontracker.com or www.macupdate.com. There is no guarantee that these utilities will work without data loss so you should have backups of your data just in case.
HAPPY HOLIDAYS!
Kappy
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I have not used either one, but I believe Volume Works has a demo version.
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This is from the Boot Camp PDF:
Removing the Windows Partition
If you no longer want to use Windows on your computer, you can use Boot Camp Assistant to remove the Windows partition from your startup disk. This returns the disk to its original configuration as a single-partition Mac OS X volume.
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Thanks!John C Lin wrote:
I'm using OSX Lion and have an external HD, which is about 40% full. I'd like to add a partition without reformatting it or deleting data if that's possible.
Very possible. However, requires that the HD's formatted as OS X Extended, has the GUID partitioning scheme, and has journaling enabled. If those conditions are met, Disk Utility will do it. -
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Hi! I have a problem in Disk Utility in which I cannot add a partition because the plus button is greyed out. I can select to make two partition in the drop down but that would probably erase everything. All I want to do is add one partition to the existing partition without erasing anything so I can dual boot Windows 8. I can't use boot camp because I can only install Windows 7 since my computer is from 2010. Thanks in advance!
^^^ with pic =).
And then just link your object/text with the standard hyperlink menu! -
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Hi,
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Using PARTITION FOR/SUBPARTITION FOR syntax to insert
We are trying to use PARTITION FOR syntax (or, better, SUBPARTITION FOR syntax) to insert into a subpartitioned table.
http://docs.oracle.com/cd/E11882_01/server.112/e26088/sql_elements009.htm#i165979
08:26:46 GM_CS_CDR@oradev02> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Solaris: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
5 rows selected.This table is has interval partitions on DATA_ORIGIN_ID and list subpartitions on TABLE_NAME.
First, a basic insert without specifying partitions:
08:10:05 GM_CS_CDR@oradev02> insert into key_ids2 (
08:11:51 2 DATA_ORIGIN_ID ,
08:11:51 3 TABLE_NAME ,
08:11:51 4 DUR_UK ,
08:11:51 5 DUR_UK_ID )
08:11:51 6 select
08:11:51 7 12 ,
08:11:51 8 TABLE_NAME ,
08:11:51 9 DUR_UK ,
08:11:51 10 DUR_UK_ID
08:11:51 11 from key_ids where table_name = 'PART'
08:11:51 12 and rownum <= 10;
10 rows created.Verifying SUBPARTITION FOR syntax on a SELECT:
08:19:43 GM_CS_CDR@oradev02>
08:26:45 GM_CS_CDR@oradev02>
08:26:45 GM_CS_CDR@oradev02>
08:26:45 GM_CS_CDR@oradev02>
08:26:45 GM_CS_CDR@oradev02> select count(*) from key_ids2
08:26:45 2 subpartition for(12,'PART');
COUNT(*)
10
1 row selected.But when we add a subpartition specification (to limit the lock to a single subpartition), we get a syntax error:
08:14:57 GM_CS_CDR@oradev02> insert into key_ids2 subpartition for(12,'PART') (
08:14:57 2 DATA_ORIGIN_ID ,
08:14:57 3 TABLE_NAME ,
08:14:57 4 DUR_UK ,
08:14:57 5 DUR_UK_ID )
08:14:57 6 select
08:14:57 7 14 ,
08:14:57 8 TABLE_NAME ,
08:14:57 9 DUR_UK||'!' ,
08:14:57 10 DUR_UK_ID
08:14:57 11 from key_ids
08:14:57 12 where table_name = 'PART'
08:14:57 13 and rownum <= 10;
insert into key_ids2 subpartition for(12,'PART') (
ERROR at line 1:
ORA-14173: illegal subpartition-extended table name syntaxSpecifying at the partition level did not work either:
08:14:58 GM_CS_CDR@oradev02> insert into key_ids2 partition for(14) (
08:15:23 2 DATA_ORIGIN_ID ,
08:15:23 3 TABLE_NAME ,
08:15:23 4 DUR_UK ,
08:15:23 5 DUR_UK_ID )
08:15:23 6 select
08:15:23 7 14 ,
08:15:23 8 TABLE_NAME ,
08:15:23 9 DUR_UK||'!' ,
08:15:23 10 DUR_UK_ID
08:15:23 11 from key_ids
08:15:23 12 where table_name = 'PART'
08:15:23 13 and rownum <= 10;
insert into key_ids2 partition for(14) (
ERROR at line 1:
ORA-14108: illegal partition-extended table name syntaxBut specifying explicit partition and subpartition does work:
08:17:45 GM_CS_CDR@oradev02> insert into key_ids2 partition (SYS_P15127) (
08:18:23 2 DATA_ORIGIN_ID ,
08:18:23 3 TABLE_NAME ,
08:18:23 4 DUR_UK ,
08:18:23 5 DUR_UK_ID )
08:18:23 6 select
08:18:23 7 12 ,
08:18:23 8 TABLE_NAME ,
08:18:23 9 DUR_UK||'!' ,
08:18:23 10 DUR_UK_ID
08:18:23 11 from key_ids
08:18:23 12 where table_name = 'PART'
08:18:23 13 and rownum <= 10;
10 rows created.
08:18:24 GM_CS_CDR@oradev02> insert into key_ids2 subpartition (SYS_SUBP15126) (
08:19:42 2 DATA_ORIGIN_ID ,
08:19:42 3 TABLE_NAME ,
08:19:42 4 DUR_UK ,
08:19:42 5 DUR_UK_ID )
08:19:42 6 select
08:19:42 7 12 ,
08:19:42 8 TABLE_NAME ,
08:19:42 9 DUR_UK||'!#' ,
08:19:42 10 DUR_UK_ID
08:19:42 11 from key_ids
08:19:42 12 where table_name = 'PART'
08:19:42 13 and rownum <= 10;
10 rows created.We have been successful in using the PARTITION FOR syntax for tables that were partitioned but not subpartitioned.
Any ideas?
Thanks,
MikeI've created a simplified script to reproduce our issue. The use of the syntax on an INSERT INTO using VALUES still produces the same error.
Thanks,
Andy
select * from v$version;
create table part_test_tbl
data_origin_id NUMBER not null,
table_name VARCHAR2(30) not null,
dur_uk VARCHAR2(250) not null,
dur_uk_id NUMBER
partition by range (data_origin_id) INTERVAL (1)
subpartition by list (TABLE_NAME)
SUBPARTITION TEMPLATE(
subpartition BLUE values ('BLUE'),
subpartition RED values ('RED'),
subpartition YELLOW values ('YELLOW'),
subpartition GREEN values ('GREEN'),
subpartition ORANGE values ('ORANGE')
(PARTITION DFLT_INTRVL VALUES LESS THAN (0)
subpartition BLUE values ('BLUE'),
subpartition RED values ('RED'),
subpartition YELLOW values ('YELLOW'),
subpartition GREEN values ('GREEN'),
subpartition ORANGE values ('ORANGE')
-- Create/Recreate indexes
create index PART_TEST_TBL_PK on PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
compress 2 local;
create unique index PART_TEST_TBL_UK on PART_TEST_TBL (TABLE_NAME, DUR_UK_ID)
compress 1;
-- Create/Recreate primary, unique and foreign key constraints
alter table PART_TEST_TBL
add constraint PART_TEST_TBL_PK primary key (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK) USING INDEX PART_TEST_TBL_PK;
alter table PART_TEST_TBL
add constraint PART_TEST_TBL_UK unique (TABLE_NAME, DUR_UK_ID) USING INDEX PART_TEST_TBL_UK;
--Add test data
BEGIN
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (0, 'BLUE', '1', 1);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (0, 'BLUE', '2', 2);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (0, 'YELLOW', '3', 3);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (0, 'GREEN', '4', 4);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (0, 'ORANGE', '5', 5);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (1, 'BLUE', '6', 6);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (1, 'BLUE', '7', 7);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (1, 'YELLOW', '8', 8);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (1, 'GREEN', '9', 9);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (1, 'ORANGE', '10', 10);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (2, 'BLUE', '11', 11);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (2, 'BLUE', '12', 12);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (2, 'YELLOW', '13', 13);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (2, 'GREEN', '14', 14);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (2, 'ORANGE', '15', 15);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (10, 'BLUE', '16', 16);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (10, 'BLUE', '17', 17);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (10, 'YELLOW', '18', 18);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (10, 'GREEN', '19', 19);
insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
values (10, 'ORANGE', '20', 20);
COMMIT;
END;
--Validate the subpartition_extended syntax
select count(*) from PART_TEST_TBL subpartition for(10,'BLUE');
--Show subpartition_extended syntax does not work on INSERT INTO
INSERT /*+APPEND */ INTO PART_TEST_TBL SUBPARTITION FOR (10,'BLUE')
(data_origin_id
,table_name
,dur_uk
,dur_uk_id)
VALUES
(10
,'BLUE'
,'16!'
,1016);
--Show subpartition_extended syntax does not work on INSERT INTO
INSERT /*+APPEND */ INTO PART_TEST_TBL SUBPARTITION FOR (10,'BLUE')
(data_origin_id
,table_name
,dur_uk
,dur_uk_id)
SELECT ptt.data_origin_id
,ptt.table_name
,ptt.dur_uk || '!' dur_uk
,ptt.dur_uk_id + 1000 dur_uk_id
FROM PART_TEST_TBL ptt
WHERE ptt.table_name = 'BLUE'
AND ptt.data_origin_id = 10;
DROP TABLE part_test_tbl PURGE;-----
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Solaris: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL> create table part_test_tbl
2 (
3 data_origin_id NUMBER not null,
4 table_name VARCHAR2(30) not null,
5 dur_uk VARCHAR2(250) not null,
6 dur_uk_id NUMBER
7 )
8 partition by range (data_origin_id) INTERVAL (1)
9 subpartition by list (TABLE_NAME)
10 SUBPARTITION TEMPLATE(
11 subpartition BLUE values ('BLUE'),
12 subpartition RED values ('RED'),
13 subpartition YELLOW values ('YELLOW'),
14 subpartition GREEN values ('GREEN'),
15 subpartition ORANGE values ('ORANGE')
16 )
17 (PARTITION DFLT_INTRVL VALUES LESS THAN (0)
18 (
19 subpartition BLUE values ('BLUE'),
20 subpartition RED values ('RED'),
21 subpartition YELLOW values ('YELLOW'),
22 subpartition GREEN values ('GREEN'),
23 subpartition ORANGE values ('ORANGE')
24 )
25 );
Table created
SQL> -- Create/Recreate indexes
SQL> create index PART_TEST_TBL_PK on PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
2 compress 2 local;
Index created
SQL> create unique index PART_TEST_TBL_UK on PART_TEST_TBL (TABLE_NAME, DUR_UK_ID)
2 compress 1;
Index created
SQL> -- Create/Recreate primary, unique and foreign key constraints
SQL> alter table PART_TEST_TBL
2 add constraint PART_TEST_TBL_PK primary key (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK) USING INDEX PART_TEST_TBL_PK;
Table altered
SQL> alter table PART_TEST_TBL
2 add constraint PART_TEST_TBL_UK unique (TABLE_NAME, DUR_UK_ID) USING INDEX PART_TEST_TBL_UK;
Table altered
SQL> --Add test data
SQL> BEGIN
2
3 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
4 values (0, 'BLUE', '1', 1);
5
6 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
7 values (0, 'BLUE', '2', 2);
8
9 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
10 values (0, 'YELLOW', '3', 3);
11
12 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
13 values (0, 'GREEN', '4', 4);
14
15 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
16 values (0, 'ORANGE', '5', 5);
17
18 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
19 values (1, 'BLUE', '6', 6);
20
21 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
22 values (1, 'BLUE', '7', 7);
23
24 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
25 values (1, 'YELLOW', '8', 8);
26
27 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
28 values (1, 'GREEN', '9', 9);
29
30 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
31 values (1, 'ORANGE', '10', 10);
32
33 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
34 values (2, 'BLUE', '11', 11);
35
36 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
37 values (2, 'BLUE', '12', 12);
38
39 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
40 values (2, 'YELLOW', '13', 13);
41
42 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
43 values (2, 'GREEN', '14', 14);
44
45 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
46 values (2, 'ORANGE', '15', 15);
47
48 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
49 values (10, 'BLUE', '16', 16);
50
51 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
52 values (10, 'BLUE', '17', 17);
53
54 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
55 values (10, 'YELLOW', '18', 18);
56
57 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
58 values (10, 'GREEN', '19', 19);
59
60 insert into PART_TEST_TBL (DATA_ORIGIN_ID, TABLE_NAME, DUR_UK, DUR_UK_ID)
61 values (10, 'ORANGE', '20', 20);
62
63 COMMIT;
64 END;
65 /
PL/SQL procedure successfully completed
SQL> --Validate the subpartition_extended syntax
SQL> select count(*) from PART_TEST_TBL subpartition for(10,'BLUE');
COUNT(*)
2
SQL> --Show subpartition_extended syntax does not work on INSERT INTO
SQL> INSERT /*+APPEND */ INTO PART_TEST_TBL SUBPARTITION FOR (10,'BLUE')
2 (data_origin_id
3 ,table_name
4 ,dur_uk
5 ,dur_uk_id)
6 VALUES
7 (10
8 ,'BLUE'
9 ,'16!'
10 ,1016);
INSERT /*+APPEND */ INTO PART_TEST_TBL SUBPARTITION FOR (10,'BLUE')
(data_origin_id
,table_name
,dur_uk
,dur_uk_id)
VALUES
(10
,'BLUE'
,'16!'
,1016)
ORA-14173: illegal subpartition-extended table name syntax
SQL> --Show subpartition_extended syntax does not work on INSERT INTO
SQL> INSERT /*+APPEND */ INTO PART_TEST_TBL SUBPARTITION FOR (10,'BLUE')
2 (data_origin_id
3 ,table_name
4 ,dur_uk
5 ,dur_uk_id)
6 SELECT ptt.data_origin_id
7 ,ptt.table_name
8 ,ptt.dur_uk || '!' dur_uk
9 ,ptt.dur_uk_id + 1000 dur_uk_id
10 FROM PART_TEST_TBL ptt
11 WHERE ptt.table_name = 'BLUE'
12 AND ptt.data_origin_id = 10;
INSERT /*+APPEND */ INTO PART_TEST_TBL SUBPARTITION FOR (10,'BLUE')
(data_origin_id
,table_name
,dur_uk
,dur_uk_id)
SELECT ptt.data_origin_id
,ptt.table_name
,ptt.dur_uk || '!' dur_uk
,ptt.dur_uk_id + 1000 dur_uk_id
FROM PART_TEST_TBL ptt
WHERE ptt.table_name = 'BLUE'
AND ptt.data_origin_id = 10
ORA-14173: illegal subpartition-extended table name syntax
SQL> DROP TABLE part_test_tbl PURGE;
Table dropped
SQL> -
How to create a third partition without messing up Boot Camp partition?
I have been running a dual-partition Boot Camp setup (with Mac OS 10.5 and Vista) on my Macbook Pro with no hitches for the past year or so. Recently, I have decided that I want to create a third partition to boot into Windows XP. Of course, Boot Camp doesn't let me do this, so I am trying to do it manually by resizing my Mac OS partition and devoting the remaining space to a new partition. However, when I try to resize my Mac OS partition in Disk Utility, it warns me that "Changing the partition map may make this disk unbootable using Windows."
So I am wondering: is there any way for me to create a new Windows partition without messing up my preexisting Boot Camp setup?I found this blog post shortly after the first BootCamp beta was out. I successfully split mine into three partitions per the instructions. However, since Leopard now lets you live partition your disk, you can probably do the partitioning via Disk Utility instead of using diskutil in Terminal.
<http://twoyearstwodays.blogspot.com/2006/05/bootcamp-sharing-data-between-osx-a nd.html> -
Partition without losing info ?
Does anyone know if there is some way I can partition my drive so I can install Ubuntu without losing any info I have ? I seem to remember there was a way but...
ThanksYou can add a partition without erasing the drive using Disk Utility (Leopard or Snow Leopard), as long as Disk Utility can move data around on existing partition(s) to create a contiguous space for the new partition. Whether Linux can be installed on a drive that uses +GUID partition table+ as the partition map scheme, I do not know.
However, before doing something like re-partitioning, or installing Linux on the same drive, you need to make a backup of at least your personal data, or even clone the entire Mac startup volume to another drive. It is always possible for something bad to happen.
I run Ubuntu Linux on my iMac, but I use VWware Fusion. It is seamless and easy. You can use the disk image (.iso) file directly without burning a disc. No separate partition required (and no need to pre-allocate space for its storage), and you can get rid of it with a few clicks of your mouse. -
Resize partitions without erasing existing data
I have one drive (internal), dual partition (OS X 10.5.2 and Vista) and I want to split the volume OS X 10.5.2 in two. I try this using Disk Utility, but one warning was showed: ..changing the partition map may make this disk unbootable using windows"
Is it warning true? What do I expect to happen in case of resizing?
If someone had have any related experience about that, I will appreciate Your advice.You can resize partitions without losing data but you won't be able to boot into Windows after that. That was a bad experience I had. My first bad experience was to repartition a dual-partition (Tiger+Windows) drive, ignoring the warning. Guess what? Lost everything and had to reinstall both OS.
Mac OS X Extended (journalled) drives can be repartitioned without losing data using the "diskutil" command in the Terminal window. Type "diskutil" and you get a list of available commands. -
How to increase Boot Camp partition without harming both Mac and Windows partition
Hello Apple Support Communities.
I have made a Boot Camp partition with my Mac partition, but the problem is that I am running out of space on my Windows partition. (Darn you, Steam Summer Sale! )
Anyways, is there any way to increase the space on my Windows partition without harming both Mac and Windows partitions. I would prefer if I didn't need to delete the Windows Partition and do everything all over again, as I need to download and set up everything all over again. I also know that changing the Windows partition is a tricky and hard thing, and one step can harm my whole computer, but I think that it is worth the risk.
I really don't care how to do it, anything, from a bootable program, to anything. I just want to know how to do it.
So is there any way that I can increase the Windows partition of my Mac without harming both Mac and Windows partitions? Thanks.This cannot be done using Boot Camp Assistant. But, you can try using Paragon Camptune X for Mac® – How it works.
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How to use partition by instead of group by?
Hi,
I am having trouble using partition by clause in following case,
column other_number with null values contains 10 records in 'some_table'
5 records with date 11-01-2009, item_code = 1
5 records with date 10-01-2009, item_code = 2
This query returns all 10 records, (which suppose to return 2)
SELECT count (a.anumber) over (partition by TO_char(a.some_date,'MM'), a.item_code) AS i_count, a.item_code,
TO_char(a.some_date,'MM')
FROM some_table
WHERE to_char(a.some_date,'yyyy') = 2009
AND a.other_number IS NULL
Works fine if I wrote like this,
SELECT count (a.anumber) AS i_count, a.item_code,
TO_char(a.some_date,'MM')
FROM some_table
WHERE to_char(a.some_date,'yyyy') = 2009
AND a.other_number IS NULL
group by TO_char(a.some_date,'MM'), a.item_code
How to use partition by in this case?Hi,
Almost all of the aggregate functions (the ones you use in a GROUP BY query) have analytic counterparts.
You seem to have already discovered that whatever values are returned by
an aggregate funcition using "GROUP BY x, y, z" can also be found with
an analytic function using "PARTITION BY x, y. z".
Aggregate queries collapse the result set.
The aggregate COUNT function:
SELECT deptno
, COUNT (*) AS cnt
FROM scott.emp
GROUP BY deptno
;tells how many of the 14 employees are in each of the 3 departments.
So does the analytic COUNT function:
SELECT deptno
, COUNT (*) OVER (PARTITION BY deptno) AS cnt
FROM scott.emp
;but the first query produces 3 rows of output, the second query produces 14.
You could get 3 rows of output using the analytic function and SELECT DISTINCT , but it's inefficient.
Which should you use? Like so many other things, the answer depends on what data you have, and what results you want from that data.
If you want collapsed results (one row per group), that's a striong indication that you'll want aggregate, not analytic functions.
If you want one row of output for every row in the table, that's a strong indication that you'll want analytic functions.
If you have a particular question, ask it. Post some sample data and the results you want from that data, as Rob said.
There is another important difference between aggreate and analytic functions: analytic functions can easily be restricted to a window , or subset, of the data set. This is something like a WHERE clause, but a WHERE clause applies to the whole query: a wondowing condition applies only to an individual row.
If you need to compute a SUM of rows with an earlier order_date than this row or an average of the last 5 rows, then you proabably want to use analytic function.
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