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SQL:  how to count cells accross columns?

Posted on 2012-03-18
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Last Modified: 2012-03-26
dbo.listings  has 25 columns
UserID is a primary key
For a userID, I want to select the total count of all cells that are not Null and have a Length of at least > 0.  Basically, I want to know for a userID, how many cells contain data (not interested in null or blank cells).

How can I do this?  
SO, say userID = 1000.  
Lets assume column names are simply Column1, Column2, etc.

How can I craft a statement that gets the count of how many columns have data for UserID 1000
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Question by:arthurh88
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5 Comments
 
LVL 93

Expert Comment

by:Patrick Matthews
ID: 37735748
Assuming those other columns are text-based...

SELECT userID,
    CASE WHEN COALESCE(Column1, '') <> '' THEN 1 ELSE 0 END +
    CASE WHEN COALESCE(Column2, '') <> '' THEN 1 ELSE 0 END +
    CASE WHEN COALESCE(Column3, '') <> '' THEN 1 ELSE 0 END +
...
    CASE WHEN COALESCE(Column25, '') <> '' THEN 1 ELSE 0 END AS PopulatedColumns
FROM SomeTable
WHERE userID = 1000

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LVL 13

Accepted Solution

by:
Ashok earned 2000 total points
ID: 37735822
If all columns are of different types, following may work better.....

Try

SELECT userID,
    CASE WHEN IsNull(Column1, '') <> '' THEN 1 ELSE 0 END +
    CASE WHEN IsNull(Column2, '') <> '' THEN 1 ELSE 0 END +
    CASE WHEN IsNull(Column3, '') <> '' THEN 1 ELSE 0 END +
...
    CASE WHEN IsNull(Column25, '') <> '' THEN 1 ELSE 0 END AS PopulatedColumns
FROM SomeTable
WHERE userID = 1000

OR

SELECT userID,
Case Column1 When Null Then 1 Else 0 End +
Case Column2 When Null Then 1 Else 0 End +
Case Column3 When Null Then 1 Else 0 End +
....
Case Column21 When Null Then 1 Else 0 End As CountTotal
from SomeTable
where UserId = 1000
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LVL 13

Expert Comment

by:Ashok
ID: 37735854
SELECT UserID,
CASE WHEN [Column1] IS NULL THEN 0 else 1 END
+ CASE WHEN [Column2] IS NULL THEN 0 else 1 END
+ CASE WHEN [Column3] IS NULL THEN 0 else 1 END
.....
+ CASE WHEN [Column25] IS NULL THEN 0 else 1 END AS CountTotal
from SomeTable
where UserId = 1000
0
 

Author Closing Comment

by:arthurh88
ID: 37736180
that worked great.  thank you
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LVL 13

Expert Comment

by:Ashok
ID: 37766484
Typing mistake in above.....

SELECT userID,
Case Column1 When Null Then 0 Else 1 End +
Case Column2 When Null Then 0 Else 1 End +
Case Column3 When Null Then 0 Else 1 End +
....
Case Column21 When Null Then 0 Else 1 End As CountTotal
from SomeTable
where UserId = 1000
0

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