Difference count(*) and count(1)

Is there any difference between count(*) and count(1)
when write select count(*) from emp
and select count(1) from emp
output of both query are same plz tell me the difference
thnks

Just as a side note. Count does behave differently if you count by a column.
ex.
select count(*) from perf_results;
   COUNT(*)
       3222
select count(fy_year) from perf_results;
COUNT(FY_YEAR)
          3207If a column has a null value it will not be counted

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Cheers - Aravind.
Scripts for you....
CREATE TABLE test
name varchar2(20)
INSERT INTO test VALUES('A');
INSERT INTO test VALUES('B');
INSERT INTO test VALUES(NULL);
INSERT INTO test VALUES(NULL);
COMMIT;
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Hi:
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Regards,
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SYSTEM@DEMO102> l
  1  select a.statistic#,b.name,a.value
  2  from v$mystat a,v$statname b
  3  where a.statistic#=b.statistic#
  4* and b.name like '%redo%'
SYSTEM@DEMO102> /
STATISTIC# NAME                                                                  VALUE
        90 redo synch writes                                                         1
        91 redo synch time                                                           0
       132 redo blocks read for recovery                                             0
       133 redo entries                                                             71
       134 redo size                                                             15976
       135 redo buffer allocation retries                                            0
       136 redo wastage                                                              0
       137 redo writer latching time                                                 0
       138 redo writes                                                               0
       139 redo blocks written                                                       0
       140 redo write time                                                           0
       141 redo log space requests                                                   0
       142 redo log space wait time                                                  0
       143 redo log switch interrupts                                                0
       144 redo ordering marks                                                       3
       145 redo subscn max counts                                                    0
16 rows selected.
SYSTEM@DEMO102> truncate table tbl_trc;
Table truncated.
SYSTEM@DEMO102> select a.statistic#,b.name,a.value
  2  from v$mystat a,v$statname b
  3  where a.statistic#=b.statistic#
  4  and b.name like '%redo%';
STATISTIC# NAME                                                                  VALUE
        90 redo synch writes                                                         3
        91 redo synch time                                                           2
       132 redo blocks read for recovery                                             0
       133 redo entries                                                             88
       134 redo size                                                             20404
       135 redo buffer allocation retries                                            0
       136 redo wastage                                                              0
       137 redo writer latching time                                                 0
       138 redo writes                                                               0
       139 redo blocks written                                                       0
       140 redo write time                                                           0
       141 redo log space requests                                                   0
       142 redo log space wait time                                                  0
       143 redo log switch interrupts                                                0
       144 redo ordering marks                                                       3
       145 redo subscn max counts                                                    0
16 rows selected.
SYSTEM@DEMO102> Nicolas.

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What is difference: standby_archive_dest and log_archive_dest_1

what is the difference on the standby database?
Some I see for standby_archive_dest: ?/dbs/arch
And for log_archive_dest_1: log_archive_dest_1 = /some_other_path/folder
Some I see are same, standby_archive_dest = log_archive_dest_1 = /some_other_path/folder
How are 9i, 10g, 11g different regarding these parameters?
Where does standby database put the shipped archive logs, using which parameter?
Edited by: user8875620 on Apr 4, 2013 9:01 AM

Where does standby database put the shipped archive logs, using which parameter?STANDBY_ARCHIVE_DEST can be used to specify where archived logs received from a primary database are stored on a standby database.
Note : In 11g this parameter is no longer to set since an appropriate location will automatically chosen
For 10g STANDBY_ARCHIVE_DEST check the below link
http://docs.oracle.com/cd/B13789_01/server.101/b10755/initparams205.htm

Please tell basic difference between "" and null for String variable.

1.What is difference between String strRemitInfo = "" and String strRemitInfo = null?
2. Which one is good practice while coding ?

1.What is difference between String strRemitInfo = ""
and String strRemitInfo = null?Emptry string and nul reference
>
2. Which one is good practice while coding ?Depends on what you want to do.

Whats the difference between and Album and a Smart Album

OK, just upgraded.... So, whats the difference between an Album and a Smart Album?
Also, I like to organise my stuff, so if I create a folder for each year, and then a project within that year, why is it that the photos are always in both - and then again if I chose to create an album specific to a project, they are there again.
So it might look:
          Folder (2012 Equine Photography)
               Project - Specific Events
                    Album - Big Barn Dressage May
Does this mean the individual photo is stored 3 times and using 3 times the space?
Thanks guys!

Mrsthebraggster wrote:
So it might look:
          Folder (2012 Equine Photography)
               Project - Specific Events
                    Album - Big Barn Dressage May
Does this mean the individual photo is stored 3 times and using 3 times the space?
No. Conceptually the Master only lives lives in the single (time based) Project you import it into. Albums are just collections of pointers that point to images in various Projects.
"Big Barn Dressage May" could be a Project, but only if it is only one day and a limited number of image files; otherwise an Album. "2012 Equine Photography" should be an album or a Folder of Albums. "Specific Events" could be an Album or a Folder of Albums.
A Project should not be used as a Folder.
From an earlier post of mine:
Folders are indeed flexible organizational tools but IMO often overused. Folders can effectively hide contents from view and therefore require users to remember how folders are nested and what is inside them. Folders were the only way to deal with single-original film, but are IMO limiting to image database thinking.
The way I look at it conceptually:
Aperture is a database (DB), and each image file lives in one Project.
Albums are just collections of Pointers that point to individual image files living in one or more Projects. Since they just contain pointers, albums can be created or deleted at will without affecting image files. Very powerful. And Albums of pointers take up almost zero space, so they are fast and do not make the Library size grow.
Keywords can be applied to every image separately or in batches. Keywords are hugely powerful and largely obviate the need for folders. Not that we should never use folders, just that we should use folders only when useful organizationally - - after first determining that using keywords and albums is not a better approach.
As one example imagine the keyword "flowers." Every image of a 100,000 images Library that has some flowers in it has the keyword flowers. Then say we want to put flowers in an ad, or as background for a show of some kind, or to print pix for a party, or even just to look for an image for some other reason. We can find every flower image in a 100k-image database in 2 seconds, and in another few seconds create an Album called "Flowers" that points to all of those individual images.
Similarly all family pix can have a keyword "family" and all work pix can have a key word "work." Each individual pic may have any number of keywords. Such pic characteristics (work, family, flowers, etc.) should not be organized via folders.
So by using keywords and albums we can have instant access to every image everywhere, very cool. And keywords and albums essentially take up no space in the database.
Another approach is to use a folder "Family" for family pix, a folder "Flowers" for flowers pix and another folder "Work" for work pix. IMO such folders usage is a very poor approach to using an images database (probably stemming from old paper or film work practices). Note that one cannot put an image with family in a field of flowers at a work picnic in all three folders; but it is instant with keywords.
HTH
-Allen

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