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select count(distinct <colname>) from <table_name>

select distinct count(<colname>) from <table_name>


What is the difference between these two ?


plz explain
Posted

1) when u write this way..
SQL
select   count(distinct ACODE) from dbo.Table_1

then it counts for different values like my table(dbo.table_1) having ACODE column which has certain values
VB
ACODE
2010
2010
2009
2011
2011
2009
2010
2011


now if i execute first query will get ans = 3, bcoz it counts only distinct values.

2)now,
SQL
select  distinct count(ACODE) from dbo.Table_1
if u execute this then u will get answer = 8

bcoz, it has 3 times -2010, 3 times - 2011 , and 2 times - 2009

this count for all the records and give output, and does not give count for distinct value.

3)if u want to analyse it more deeply then try it by exicuting this query..

select   distinct count(ACODE),ACODE from dbo.Table_1 group by ACODE



hope this help..
 
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Comments
Ajit Kumar Nayak 17-Oct-11 9:02am    
Thanks a lot
[no name] 17-Oct-11 10:35am    
yah, it sounds good
Read the following :
COUNT (Transact-SQL)[^]
 
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