Click here to monitor SSC
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


COUNT() Function


COUNT() Function

Author
Message
yogyogi97
yogyogi97
SSC-Enthusiastic
SSC-Enthusiastic (188 reputation)SSC-Enthusiastic (188 reputation)SSC-Enthusiastic (188 reputation)SSC-Enthusiastic (188 reputation)SSC-Enthusiastic (188 reputation)SSC-Enthusiastic (188 reputation)SSC-Enthusiastic (188 reputation)SSC-Enthusiastic (188 reputation)

Group: General Forum Members
Points: 188 Visits: 152
Comments posted to this topic are about the item COUNT() Function
mickyT
mickyT
Ten Centuries
Ten Centuries (1.3K reputation)Ten Centuries (1.3K reputation)Ten Centuries (1.3K reputation)Ten Centuries (1.3K reputation)Ten Centuries (1.3K reputation)Ten Centuries (1.3K reputation)Ten Centuries (1.3K reputation)Ten Centuries (1.3K reputation)

Group: General Forum Members
Points: 1332 Visits: 3317
Thanks for the question
kapil_kk
kapil_kk
SSCrazy
SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)

Group: General Forum Members
Points: 2591 Visits: 2764
really good basic question Yogi :-)
Thanks for it:-)

_______________________________________________________________
To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/
Danny Ocean
Danny Ocean
UDP Broadcaster
UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)UDP Broadcaster (1.5K reputation)

Group: General Forum Members
Points: 1454 Visits: 1549
[b]yogyogi97 (4/15/2013)
COUNT(convert(int,NULL)) - It will give count as 0 always. Don't know why it is giving 0 count however COUNT() function counts NULL values also.


Please go through below select statement. Here we are try to convert "Varchar" and "int" into "NULL".
And as per as your Explanation. Count () function counts only non-NULL values. That's why its give output as "0".
I think so. If anyone have some other aspect, please let us know. :-)

select  CONVERT(INT, NULL), COUNT (CONVERT(INT, NULL)), CONVERT(VARCHAR(111), NULL), COUNT (CONVERT(VARCHAR(111), NULL)) 



Thanks for question :-)

Thanks
Vinay Kumar
-----------------------------------------------------------------
Keep Learning - Keep Growing !!!
www.GrowWithSql.com
kapil_kk
kapil_kk
SSCrazy
SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)

Group: General Forum Members
Points: 2591 Visits: 2764
For the last query:
select COUNT(convert(int,NULL)) from #temp
It will return 0 because when you execute the query:
SELECT CONVERT(int,NULL) it will return NULL and as the return type of COUNT is INT so NULL will implicitly
converted to '0'.
Hope it will clear to you now Yogi :-)

_______________________________________________________________
To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/
Koen Verbeeck
Koen Verbeeck
SSCoach
SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)

Group: General Forum Members
Points: 18957 Visits: 13250
Nice question, thanks.


How to post forum questions.
Need an answer? No, you need a question.
What’s the deal with Excel & SSIS?
My blog at SQLKover.

MCSE Business Intelligence - Microsoft Data Platform MVP
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
SSCertifiable
SSCertifiable (6.4K reputation)SSCertifiable (6.4K reputation)SSCertifiable (6.4K reputation)SSCertifiable (6.4K reputation)SSCertifiable (6.4K reputation)SSCertifiable (6.4K reputation)SSCertifiable (6.4K reputation)SSCertifiable (6.4K reputation)

Group: General Forum Members
Points: 6414 Visits: 7194
Nice back-to-basics question, thanks

____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
TomThomson
TomThomson
SSChampion
SSChampion (11K reputation)SSChampion (11K reputation)SSChampion (11K reputation)SSChampion (11K reputation)SSChampion (11K reputation)SSChampion (11K reputation)SSChampion (11K reputation)SSChampion (11K reputation)

Group: General Forum Members
Points: 11411 Visits: 12091
Nice question, but as only one list of values ended with 0 it was easy to get the answer without checking anything else, so much easier than it looked at first sight.

If there had been two options with 0 at the end it might have tested whether people knew that count(ALL, expression) and count(expression) meant the same, or that count(constant) was the same as count(*), but as it was the answer could be got without any of that.

Tom

kapil_kk
kapil_kk
SSCrazy
SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)SSCrazy (2.6K reputation)

Group: General Forum Members
Points: 2591 Visits: 2764
L' Eomot Inversé (4/16/2013)
Nice question, but as only one list of values ended with 0 it was easy to get the answer without checking anything else, so much easier than it looked at first sight.

If there had been two options with 0 at the end it might have tested whether people knew that count(ALL, expression) and count(expression) meant the same, or that count(constant) was the same as count(*), but as it was the answer could be got without any of that.

Right Tom, question will be lil bit tricky if there were two option with ending 0....
May be the percentage of no of incorrect will be more than current ;-)

_______________________________________________________________
To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/
manik_anu
manik_anu
Old Hand
Old Hand (398 reputation)Old Hand (398 reputation)Old Hand (398 reputation)Old Hand (398 reputation)Old Hand (398 reputation)Old Hand (398 reputation)Old Hand (398 reputation)Old Hand (398 reputation)

Group: General Forum Members
Points: 398 Visits: 302
kapil_kk (4/15/2013)
For the last query:
select COUNT(convert(int,NULL)) from #temp
It will return 0 because when you execute the query:
SELECT CONVERT(int,NULL) it will return NULL and as the return type of COUNT is INT so NULL will implicitly
converted to '0'.
Hope it will clear to you now Yogi :-)



thanks kapil... nice question

Manik
You cannot get to the top by sitting on your bottom.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search