January 27, 2014 at 4:00 am
Hi,
how can i get distinct Value from each column from a Table?
I think dynamic-sql is the rigth way 🙂
Foreach column in Table
Select distinct [column] from Table
next
Thanks
Nicole
January 27, 2014 at 4:54 am
Another way is to copy the run the contents of the below SELECT statement:
SELECT 'SELECT DISTINCT [' + COLUMN_NAME + '] FROM ' + TABLE_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'SomeTable' -- your table
---------------------------------------------------------
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Howard Zinn
January 27, 2014 at 7:42 am
Another way to get your code:SELECT 'SELECT DISTINCT ' + AC.[name] + ' AS Column_Name FROM ' + T.[name]
FROM sys.tables AS T
INNER JOIN sys.all_columns AC ON T.[object_id] = AC.[object_id]
INNER JOIN sys.types TY ON AC.[system_type_id] = TY.[system_type_id]
AND AC.[user_type_id] = TY.[user_type_id]
WHERE T.[is_ms_shipped] = 0
I think the dynamic code using sp_executesql would be helpful.
January 27, 2014 at 5:38 pm
Here's my interpretation of your requirement:
WITH SampleData (C1, C2) AS
(
SELECT 'A', 'AA'
UNION ALL SELECT 'A', 'BB'
UNION ALL SELECT 'B', 'CC'
UNION ALL SELECT 'C', 'CC'
UNION ALL SELECT 'C', 'DD'
)
SELECT Col, C
FROM
(
SELECT *, rn=ROW_NUMBER() OVER (PARTITION BY Col, C ORDER BY (SELECT NULL))
FROM SampleData a
CROSS APPLY
(
VALUES ('C1', C1),('C2', C2)
) b (Col, C)
) a
WHERE rn=1;
Please let us know if any of these responses have been helpful.
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My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.
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[url url=http://www.sqlservercentral.com/articles/St
March 9, 2023 at 4:21 am
This lists all not null columns with the record counts
--Drop table #T
select Row_number() over(order by column_name) Row,COLUMN_NAME
into #T
from INFORMATION_SCHEMA.columns
where table_name = '<table_name>'
Create table #Results ([Column_Name] varchar(200), Rec_Count int)
--Truncate table #Results
declare @col varchar(50), @n int=1, @STR varchar(max)
while @n <= (select count(*) from #T)
begin
set @col = (select column_name from #T where Row = @n)
set @n=@n+1
set @STR = 'Insert into #Results select '''+@col+''' as Column_Name, count( ['+@col+']) Rec_Count '+ ' from <table_name> having count( ['+@col+']) >0 '
exec (@str)
end
select * from #Results
March 9, 2023 at 9:51 pm
I have to ask... what problem are you trying to solve here?
--Jeff Moden
Change is inevitable... Change for the better is not.
March 10, 2023 at 7:23 pm
A newbie replied to a decade old post. I'm not sure you're going to get much info from the original poster.
Drew
J. Drew Allen
Business Intelligence Analyst
Philadelphia, PA
Viewing 7 posts - 1 through 6 (of 6 total)
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